Fighting to get something done (6)
I believe the answer is:
action
This clue is a double definition.
'fighting' is the first definition.
(as in military action)
'something done' is the second definition.
(I've seen this before)
'to get' acts as a link.
(Other definitions for action that I've seen before include "Court case" , "Litigation" , "claim in court" , "Military engagement" , "Jarndyce and Jarndyce, say" .)