Key employed by Rolling Stones right for crooner? (8)
I believe the answer is:
songster
'crooner?' is the definition.
(thesaurus)
'key employed by rolling stones right' is the wordplay.
'key' becomes 'g' (I've seen this in other clues**).
'employed by' means one lot of letters goes inside another.
'rolling' indicates anagramming the letters.
'right' becomes 'r' (common abbreviation).
'stones' anagrammed gives 'sonste'.
'g' put inside 'sonste' is 'songste'.
'songste'+'r'='SONGSTER'
'for' acts as a link.
(Other definitions for songster that I've seen before include "'e's strong (anag.)" , "crooner?" , "Berlin, for example" , "vocalist" , "Singer" .)