Across
I am at concert, and put out a piece of music (9)
I haven't cracked this one yet — but Fifteensquared have:
A charade of I’M (‘I am’) plus PROM (promenade ‘concert’) plus PTU, an anagram (‘out’) of ‘put’. I am particularly fond of Schubert’s Impromptus.
One rascal that can beat nine or ten (5)
I haven't cracked this one yet — but Fifteensquared have:
A reference to card games where a KNAVE or Jack ranks higher in a suit than the 9 or 10.
Composer’s heart problem returned (7)
Fail to appear for pub performance perhaps (5,2)
Unoccupied, love to be cast in a film (4)
I haven't cracked this one yet — but Fifteensquared have:
An envelope (‘to be cast in’) of O (‘love’) in VID (video, ‘film’).
Queen bee only confused by a new name (4,6)
I haven't cracked this one yet — but Fifteensquared have:
A charade of ‘a’ plus N (‘new’) plus N (‘name’) plus EBOLEYN, an anagram (‘confused’) of ‘bee only’.
Create lines on paper for soft toy (3,4)
Runs on the shore, having to live with twinges (7)
Old Chancellor not going about town (10)
Energy from writer, one moving along (4)
I haven't cracked this one yet — but Fifteensquared have:
BIRO (‘writer’) with the I moved along one.
Recoil from being pierced by a stone shaped like a spear point (7)
I haven't cracked this one yet — but Fifteensquared have:
An envelope (‘being pierced by’) of ‘a’ plus ST (‘stone’ 14 lb) in HATE (‘recoil from’).
I won’t mention the rest, even quickly (3,2,2)
Study one initially complicated section of maths (5)
Edible grains in near frozen state stuck to part of face (5,4)
Down
Was first to see a pattern that threatens the monarch (10,5)
Arranging to take power, but refusing to take advantage (8)
I haven't cracked this one yet — but Fifteensquared have:
An envelope (‘to take’) of P (‘power’) in SORTING (‘arranging’).
Frustrate one buttoned up for Olympic event (4)
I haven't cracked this one yet — but Fifteensquared have:
Two and a half definitions. In the Olympic event, the foil has a button on the point so you cannot actually impale your opponent.
Not forced to disband one platoon (8)
Be after contract United accepted (6)
State that is briefly satisfactory (8)
I haven't cracked this one yet — but Fifteensquared have:
OK (‘satisfactory’) is the USPS approved abbreviation for the state.
Cut of meat, second to go bad (6)
Be very discreet and retain a personal lawyer (4,4,7)
I haven't cracked this one yet — but Fifteensquared have:
Definition and literal interpretation.
Say, Roman soldier up in old tree (8)
I haven't cracked this one yet — but Fifteensquared have:
An envelope (‘in’) of IG, a reversal (‘up’ in a down light) of GI (US ‘soldier’) in O (‘old’) plus LARCH (‘tree’). The definition is a reference to the Russian oligarch, Roman Abramovich (one-time owner of Chelsea F.C.).
Express disapproval of girl with glasses going to dance (8)
March round in ragged sort of progression (8)
Object to being given another errand? (6)
As authority, accepts passes (4,2)
Dip into Brown Book at last (4)
Type letters or click words in the clue