Brad of "Fight Club” (4)
I believe the answer is:
pitt
'brad of fight club' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for pitt that I've seen before include "William - the Younger, twice PM" , "William --, who became Prime Minister at 24" , "Youngest-ever British prime minister, d. 1806" , "One of two Tory prime ministers" , "Elder and Younger PMs" .)