Finding composer before concert ends (7)
I believe the answer is:
verdict
'finding' is the definition.
(verdict is a kind of finding)
'composer before concert ends' is the wordplay.
'composer' becomes 'verdi' (I've seen this before**).
'before' is a charade indicator (letters next to each other).
'ends' means to remove the middle letters.
'concert' with its middle removed is 'ct'.
'verdi'+'ct'='VERDICT'
(Other definitions for verdict that I've seen before include "Result of deliberation" , "The findings of a jury" , "What a jury brings in" , "Legal finding" , "Decision of a jury" .)