Compensation for cancelled series of games (6)
I believe the answer is:
offset
'compensation' is the definition.
(I know that offset is a type of compensation)
'cancelled series of games' is the wordplay.
'cancelled' becomes 'off' (similar in meaning).
'series of games' becomes 'set' (tennis).
'off'+'set'='OFFSET'
'for' is the link.
(Other definitions for offset that I've seen before include "Balance out" , "Amount by which a thing is out of line" , "Place at an angle to the main alignment" , "Counteract to compensate" , "Place out of line" .)