Counterbalance or compensate for (6)
I believe the answer is:
offset
This clue is a double definition.
'counterbalance' is the first definition.
(I know that counterbalance is a more specific form of offset)
'compensate for' is the second definition.
(I've seen this in another clue)
(Other definitions for offset that I've seen before include "Distance out of line" , "Balance out" , "Place out of line" , "Something that compensates" , "Amount by which a thing is out of line" .)