Across
Shaft British champion from behind with shout of approval (8)
I haven't cracked this one yet — but Fifteensquared have:
B (British) + HERO (champion) reversed (from behind) + OLÉ (exclamation of approval, support or encouragement)
Crushed Yank chopped ecstasy in Palladium (6)
I haven't cracked this one yet — but Fifteensquared have:
PUL L (yank) excluding the final letter (chopped) L + ( E [ecstasy tablet] contained in [in] PD [chemical symbol for palladium])
Send message to jam makers about excellent setter (4)
Make stretchy laces tie at dances (10)
Brownies bring food items about eleven (6)
Band that is excluded previously has gone platinum (8)
Did new opener to gig with New Order's Ceremony ? (7)
I haven't cracked this one yet — but Fifteensquared have:
Anagram of (with new order) DID NEW and G ( first letter of [opener to] G IG
Serpent's fantastic here! (7)
I haven't cracked this one yet — but Fifteensquared have:
Anagram of (fantastic) SERPENT
Justification of lay people on guitar periodically (8)
I haven't cracked this one yet — but Fifteensquared have:
APOLOGIA ( letters 2, 4, 6, 8, 10, 12, 14 and 16 [periodically] of L A Y P E O P L E O N G U I T A R)
Amplifiers lifted acoustic sound Eddie Rabbitt supplied principally (6)
I haven't cracked this one yet — but Fifteensquared have:
LASERS ( first letters [principally] of each of L IFTED A COUSTIC S OUND E DDIE R ABBITT S UPPLIED)
Swingers perhaps broadcast Ben Stiller's lover initially swapping with Tack (10)
I haven't cracked this one yet — but Fifteensquared have:
Anagram of (broadcast) BEN STIL L ER with an L ( first letter of [initially] L OVER) being replaced by (swapping with ) I (Tack is the setter of this puzzle)
Obscure celeb luring crowds (4)
One hunts criminal by river in Cornwall (6)
Go away to grasp English! editor shrieked (8)
I haven't cracked this one yet — but Fifteensquared have:
( SCRAM [go away!] containing [to grasp] E [English]) + ED (editor)
Down
Way of working AC/DC stories we hear into rally (8)
Vincent Simmons's strand of DNA (4)
I haven't cracked this one yet — but Fifteensquared have:
GENE ( a specific sequence or parts of a sequence of DNA ) double definition
Fashion line presenters ultimately? (6)
Flight that can't have happened (7)
Second player on baseball field done for (8)
Bars want lean baloney sandwiches (10)
I haven't cracked this one yet — but Fifteensquared have:
BS (bullshit; baloney) containing (shelters) ( LACK [wanting] + LIST [lean])
Black knight captures to counter (6)
I haven't cracked this one yet — but Fifteensquared have:
( JET [black] + N [knight, in chess notation]) containing (captures) TO
Collapsed Lung dine on hollow chocolate treat (10)
Wiping out born batsman once focus goes (8)
I haven't cracked this one yet — but Fifteensquared have:
NÉ (of a man, born) + GAT T ING (reference Mike GATTING [born 1957], English cricketer [batsman] who captained the English Test team between 1986 and 1988) excluding the central letter (once the focus goes) T
Brought up terribly turn out rude (8)
Specials end up supporting Arctic Monkeys primarily? Flipping nonsense! (7)
I haven't cracked this one yet — but Fifteensquared have:
([ S {special} + S {special} giving specials] + END + AM [ first letters of {primarily} each of A RCTIC and M ONKEYS]) all reversed (flipping)
Gangster pursues demure chief (6)
Some Zulus travel for five year periods (6)
Witness eclipse (4)
Type letters or click words in the clue