Bill Hill, the thespian (5)
I believe the answer is:
actor
'the thespian' is the definition.
(synonyms)
'bill hill' is the wordplay.
'bill' becomes 'ac' (short for account).
'hill' becomes 'tor' (tor is a kind of hill).
'ac'+'tor'='ACTOR'
(Other definitions for actor that I've seen before include "Person performing on stage or screen" , "Cruise, e.g." , "For example, Colman" , "Dramatic artist" , "Croat (anag.)" .)