Transcribe aria to man and his sweetheart (9)
I believe the answer is:
inamorata
'his sweetheart' is the definition.
'transcribe aria to man' is the wordplay.
'transcribe' indicates an anagram.
'aria'+'to'+'man'='ariatoman'
'ariatoman' is an anagram of 'INAMORATA'.
'and' acts as a link.
(Other definitions for inamorata that I've seen before include "Sweetheart" , "A woman loved" , "Girlfriend" , "Woman beloved" , "Woman in love" .)