Cockney injured but ready to fight (5)
I believe the answer is:
armed
This clue is a double definition.
'cockney injured' is the first definition.
('harmed' - similar in meaning - said with a cockney accent, dropping the 'H')
'ready to fight' is the second definition.
(I've seen this in another clue)
'but' is the link.
(Other definitions for armed that I've seen before include "Prepared for attack" , "Like Mars" , "Tooled up" , "Supplied with weapons" , "Bearing weapons" .)