Communist accepting war prize (6)
I believe the answer is:
reward
'prize' is the definition.
(a prize may be given as a reward)
'communist accepting war' is the wordplay.
'communist' becomes 'red' (red is a kind of communist).
'accepting' indicates putting letters inside.
'red' going around 'war' is 'REWARD'.
(Other definitions for reward that I've seen before include "Drawer (anag.)" , "Gift given to show appreciation of a good deed" , "Payment in appreciation" , "Prize; pay-off" , "Desert" .)