Instrument's bent with room to play (8)
I believe the answer is:
trombone
'instrument's' is the definition.
(trombone is a kind of instrument)
'bent with room to play' is the wordplay.
'with' means one lot of letters go next to another.
'to play' is an anagram indicator.
'bent'+'room'='bentroom'
'bentroom' with letters rearranged gives 'TROMBONE'.
(Other definitions for trombone that I've seen before include "play this" , "Brass musical instrument with slide" , "Blow me!" , "Bfrass wind instrument with slide" , "source of notes" .)