Drunkard in Bizet opera (5)
I believe the answer is:
toper
'drunkard' is the definition.
(I've seen this in other clues)
'in bizet opera' is the wordplay.
'in' indicates a hidden word.
'TOPER' is hidden in the letters of 'bizet opera'.
(Other definitions for toper that I've seen before include "Someone with a drink problem" , "Regular drinker" , "Lush" , "Trope for habitual drinker" , "Excessive drinker" .)