Organising opera, sir? I’m someone who maybe can help? (10)
I believe the answer is:
impresario
'someone who maybe can help?' is the definition.
'impresario' can be an answer for 'someone' (impresario is a kind of someone). I'm not certain of the rest of the definition.
'organising opera sir? i'm' is the wordplay.
'organising' indicates anagramming the letters.
'opera'+'sir'+'im'='operasirim'
'operasirim' anagrammed gives 'IMPRESARIO'.
(Other definitions for impresario that I've seen before include "Organiser of musical events etc" , "As company manager" , "Theatrical entrepreneur" , "Arranger of concerts, etc" , "Sponsor and manager of public entertainments" .)