…according to old actor (9)
I believe the answer is:
performer
'actor' is the definition.
(actor is a type of performer)
'according to old' is the wordplay.
'according to' becomes 'per' (I've seen this before).
'old' becomes 'former' (I've seen this before).
'per'+'former'='PERFORMER'
(Other definitions for performer that I've seen before include "Fred Astaire, say" , "player" , "Entertainer" , "star?" , "Such as a musician or actor" .)