Compensate for (6)
I believe the answer is:
offset
'compensate for' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for offset that I've seen before include "Compensate for - printing method" , "Amount by which something is out of line" , "make an effort" , "Counterbalance(d)" , "Compensation - printing process" .)