Opinion of composer, extremely coherent (7)
I believe the answer is:
verdict
'opinion' is the definition.
(verdict can mean an opinion or judgment)
'composer extremely coherent' is the wordplay.
'composer' becomes 'Verdi' (Italian composer Giuseppe Verdi).
'extremely' says to hollow out the word (remove centre letters) (only the extremes of the word are used).
'coherent' with its centre taken out is 'ct'.
'verdi'+'ct'='VERDICT'
'of' acts as a link.
(Other definitions for verdict that I've seen before include "What a jury brings in" , "Decision, judgement" , "Decision arrived at in a court of law" , "sentence" , "Legal finding" .)