Across
Pigeon in port briefly with stick from Brighton? (8)
Musical composition has right person on pitch (6)
They applaud one hundred fast movers on track? (8)
Long time in enclosure being theatrical (6)
Quick words to music biddy regularly missed (5)
I haven't cracked this one yet — but Fifteensquared have:
RAP (rhythmic speaking of words accompanied by music) + [b] I [d] D [y] with alternate (regular) letters missed out.
Gold lining grand urinal bewildered maiden (9)
I haven't cracked this one yet — but Fifteensquared have:
AU (chemical symbol for gold, from Latin aurum ), inserted into (lining) an anagram (bewildered) of G (grand = slang for £1000 or $1000) + URINAL . Maiden, as in “maiden voyage” = inaugural = the first occurrence of something.
Spectacular performer's week in quiet country (7)
Metal spun in Shanghai and Baghdad (7)
I haven't cracked this one yet — but Fifteensquared have:
The chemical symbol for the metal mercury is Hg (from an earlier Greek-derived name hydrargyrum ); the letters HG are reversed (spun round) in both [shan]GH[ai] and [ba]GH[dad].
Banners Poles badly singe beforehand (7)
I haven't cracked this one yet — but Fifteensquared have:
N + S (abbreviations for the North and South Poles), with an anagram (badly) of SINGE before.
Solo work about rascal in classical rural setting (7)
Star qualities help primarily in securing many album sales (9)
Pieces band arranged back-to-front (5)
Make another change to grass by centre of site (6)
Festival star's powerful piece on PM (8)
Clergyman made a confession to some extent (6)
Practise on vehicle used for final journey (8)
Down
Documents contents of grey trousers (7)
Supports children playing pianos (including Mike) (9)
I haven't cracked this one yet — but Fifteensquared have:
CH (abbreviation for children, in genealogy records perhaps?) + anagram (playing) of PIANOS , including M (Mike in the radio alphabet). Champion, as a verb = support = give one’s backing to.
Party extremely permissive duke's high? (5)
I haven't cracked this one yet — but Fifteensquared have:
DO (slang for a party) + end letters (extremely) of P [ermissiv] E + D (abbreviation for duke). Doped = high = slang for under the influence of drugs.
Form most of stanza number one travelling north (7)
I haven't cracked this one yet — but Fifteensquared have:
Most of VERS [e] (stanza = section of a poem or song text), then NO (no. = abbreviation for number, from numero ) + I (one in Roman numerals) reversed (travelling north = upwards in a down clue).
Feline energy excited corgi that's clear (9)
Half of standard radio confirmation (5)
I haven't cracked this one yet — but Fifteensquared have:
Half of [jolly] ROGER = pirate flag = standard. Word used in radio communications to mean “message received and acknowledged” = confirmation.
Payment from King with allegiance lacking at first (7)
8's address maybe shared by Emma and Amanda (4)
Grandee in AGM if breaking up company (9)
The German runner in UK crowned by one in French clothing (9)
Central section in finale came on once more (7)
Two seconds hold acceptable for wrestling (4)
I haven't cracked this one yet — but Fifteensquared have:
S (abbreviation for second) + MO (short for moment = second), so “two seconds”, containing U (acceptable?) Perhaps the U is as in “U and non-U” = acceptable to upper-class society; or possibly a U (unclassified) grade in an exam = just about acceptable but not very good.
Calm animal good in a hot country (7)
I haven't cracked this one yet — but Fifteensquared have:
ASS (another word for donkey = animal), then G (abbreviation for good) inserted into UAE (United Arab Emirates = a hot country). As in to calm / assuage someone’s fears.
Lack of muscle on view when cold descends (7)
I haven't cracked this one yet — but Fifteensquared have:
AB (short for abdominal muscle, though more usually used in the plural form “abs”), then SCENE (view) with the C (abbreviation for cold) moving a couple of places towards the end (descending, in a down clue).
An age to put up place for a concert (5)
I haven't cracked this one yet — but Fifteensquared have:
AN ERA (an age) reversed (to put up = upwards in a down clue).
Excite highest level in auditorium (5)
Type letters or click words in the clue