Across
Leading actors, high-pitched? (6)
Superficial harm resulting from friction among climbers (4,4)
Piano included in arrangement of eg Irish or Italian composer (8)
I haven't cracked this one yet — but Fifteensquared have:
P (piano, in music notation) in *(eg irish) [anag: arrangement for ]
Extended rant from one caught in traffic (6)
Doctor agreed on cure – given new heart (12)
Accumulation of ice in December gales (4)
Campanological scandal? Pay to get through it (8)
Herb and I coming across right area for capital (8)
I haven't cracked this one yet — but Fifteensquared have:
BASIL ("herb") and I coming across R (right) + A (area)
His jumble is included by Disraeli – for instance! (4)
I haven't cracked this one yet — but Fifteensquared have:
An anagram of EARL can be found in the letters of (Dis) RAEL (i), so "his jumble is included". Disraeli was 1st Earl of Beaconsfield.
Measure concealing dishonest statements about firm is most unwise (12)
I haven't cracked this one yet — but Fifteensquared have:
FOOT ("measure") concealing LIES ("dishonest statement") about HARD ("firm")
Colour used finally in my opening statement? (6)
I haven't cracked this one yet — but Fifteensquared have:
(use) D [ finally ] in IN I GO (a "statement" made by one "opening" a door, perhaps)
Plant one in Guardian, perhaps, with indication of hesitancy (8)
I haven't cracked this one yet — but Fifteensquared have:
I (one) in ORGAN (another name for a newspaper, so "Guardian, perhaps") with UM ("indication of hesitation")
Like English author, they check for flaws in material (8)
Stuff thrown out from jet ace reassembled (6)
Down
Hold up for quick inspection (4)
I haven't cracked this one yet — but Fifteensquared have:
<=KEEP ("hold", up )
Vegetable in a healthy establishment, with sauces added (9)
Bouncer putting two grand in bank (6)
Rule, as stated, over Persians, Afghans, and others – come down hard on all (4,4,3,4)
Terriers in pub still running amok (3,5)
Early problem raised in land of cats? (5)
I haven't cracked this one yet — but Fifteensquared have:
<=(AM (ante meridiem, so "early") + RUB ("problem"), raised ) The solution refers to the Burmese, a breed of cat.
Those mortified by bad cluemanship? They’re still aware of grouse (3,7)
I haven't cracked this one yet — but Fifteensquared have:
A crossword SETTER could be "mortified" by "bad cluemanship" and become RED with embarassment. A red setter is a gun dog, and will go still when birds such as grouse are around to let their master know.
Does try to outrun these pursuers (10)
Breed in Grand National from Europe (5,4)
Infamous criminal better placed in solitary (2,6)
Like certain animals in pounds and ounces, say (6)
I haven't cracked this one yet — but Fifteensquared have:
Cryptic (or perhaps a double) definition, describing cats.
Pioneer space-traveller left, otherwise called about one (5)
I haven't cracked this one yet — but Fifteensquared have:
L (left) + AKA (also known as, so "otherwise called") about I (one) Laika was a stray mongrel sent into space by the Soviets in 1957. She died of hypothermia during the mission.
Male you tease audibly, fool (4)
Type letters or click words in the clue