Help with a Verdi opera (4)
I believe the answer is:
aida
'verdi opera' is the definition.
(I've seen this before)
'help with a' is the wordplay.
'help' becomes 'aid' (synonyms).
'with' is a charade indicator (letters next to each other).
'aid'+'a'='AIDA'
(Other definitions for aida that I've seen before include "title role" , "Verdi's slave girl" , "Verdi's Egyptian opera" , "slave of Covent Garden" , "Verdi's opera set in ancient Egypt" .)