Prepared for conflict having worked land, though not initially (5)
I believe the answer is:
armed
'prepared for conflict' is the definition.
(armed with weapons)
'worked land though not initially' is the wordplay.
'worked land' becomes 'farmed' (I've seen this before).
'though not initially' means to remove the first letter.
'farmed' with its first letter taken away is 'ARMED'.
'having' acts as a link.
(Other definitions for armed that I've seen before include "Carrying a weapon" , "unlike the Venus of Milo" , "Given weapons" , "Having guns" , "equipped for fighting" .)