Kentucky fort (4)
I believe the answer is:
knox
'kentucky fort' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for knox that I've seen before include "Fort . . . . holds the USA's gold bullion" , "John --, Scottish religious reformer" , "See 21" , "Scotttish churchman" , "See 24 Down" .)