Return like for like (9)
I believe the answer is:
retaliate
'return like for like' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for retaliate that I've seen before include "Get revenge" , "Attack in return for attack" , "Get one's own back" , "Act in revenge" , "Make tit-for-tat attack" .)