Take retribution (6)
I believe the answer is:
avenge
'take retribution' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for avenge that I've seen before include "To seek vengeance" , "Get back at for (a wrong)" , "Repay injury" , "Retaliate on behalf of" , "Get satisfaction for wrong done" .)