Italian singer finally in charge in English opera company (6)
I believe the answer is:
enrico
'italian' is the definition.
(Italian name)
'singer finally in charge in english opera company' is the wordplay.
'finally' indicates one should take the final letters.
'in charge' becomes 'ic'.
'in' indicates putting letters inside.
'english opera company' becomes 'eno' (English National Opera).
The final letter of 'singer' is 'r'.
'r'+'ic'='ric'
'ric' going within 'eno' is 'ENRICO'.
(Other definitions for enrico that I've seen before include "Italian Henry like Caruso" , ". . . . . . Caruso (tenor)" .)