Opera embraced by Cameron or May (5)
I believe the answer is:
norma
'opera' is the definition.
(I've seen this before)
'embraced by cameron or may' is the wordplay.
'embraced' indicates the answer is hidden within the clue.
'NORMA' is hidden within 'by cameron or may'.
(Other definitions for norma that I've seen before include "Girl" , "Bellini's heroine" , "Bellini drama" , "Roman (anag) -- opera" , "Female" .)