Entertainer cultivated ad income (8)
I believe the answer is:
comedian
'entertainer' is the definition.
(comedian is a kind of entertainer)
'cultivated ad income' is the wordplay.
'cultivated' indicates anagramming the letters.
'ad'+'income'='adincome'
'adincome' is an anagram of 'COMEDIAN'.
(Other definitions for comedian that I've seen before include "Stand-up" , "Hope, say" , "performer" , "cracking bloke?" , "wit" .)