Actor Brad ____ (4)
I believe the answer is:
pitt
'actor brad' is the definition.
(US actor Brad Pitt)
This is the entire clue.
(Other definitions for pitt that I've seen before include "Former British PM" , "a name in politics once" , "Brad --, US actor" , "William - the Younger, twice PM" , "Statesman, Earl of 10" .)