Hunter needs gun to follow game (6)
I believe the answer is:
nimrod
'hunter' is the definition.
(thesaurus)
'gun to follow game' is the wordplay.
'gun' becomes 'rod' (rod is a kind of gun).
'to follow' means one lot of letters go next to another.
'game' becomes 'nim' (I've seen this before).
'rod' after 'nim' is 'NIMROD'.
'needs' acts as a link.
(Other definitions for nimrod that I've seen before include "Antarctic summit" , "Best-known of Elgar's Enigma Variations" , "'Mighty Biblical ruler, builder of the Tower of Babel (6)'" , "Mighty hunter of Genesis" , "Biblical hunter - aircraft" .)