"Goldfinger" fort (4)
I believe the answer is:
knox
'goldfinger fort' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for knox that I've seen before include "Fort . . . . holds the USA's gold bullion" , "See 21" , "preacher" , "Scotttish churchman" , "Theologian" .)