Producer of opera is prim dropping piano rendition (10)
I believe the answer is:
impresario
'producer' is the definition.
('impresario' can be a synonym of 'producer')
'opera is prim dropping piano rendition' is the wordplay.
'dropping' suggests deleting specific letters.
'piano' becomes 'p'.
'rendition' indicates an anagram.
'opera'+'is'+'prim'='operaisprim'
'operaisprim' with 'p' taken away is 'oeraisprim'.
'oeraisprim' anagrammed gives 'IMPRESARIO'.
'of' is the link.
(Other definitions for impresario that I've seen before include "Stage promoter" , "Theatrical manager" , "Promoter of public entertainments" , "theatre director" , "opera manager" .)