Go for fix (6)
I believe the answer is:
repair
I believe this clue is a double definition.
'go' is the first definition.
(I've seen this before)
'fix' is the second definition.
('repair' can be a synonym of 'fix')
'for' is the link.
(Other definitions for repair that I've seen before include "darn?" , "Withdraw" , "Proceed - restore" , "resort" , "It may be effected by" .)