Work to reduce effect of token performance (10)
I believe the answer is:
counteract
'work to reduce effect' is the definition.
I can't judge whether this defines the answer.
'token performance' is the wordplay.
'token' becomes 'counter' (counter can mean a token or chip).
'performance' becomes 'act' (act is a kind of performance).
'counter'+'act'='COUNTERACT'
'of' acts as a link.
Can you help me to learn more?
(Other definitions for counteract that I've seen before include "Oppose" , "Take steps to neutralise" , "Work against" , "Nullify" , "Tell against (something)" .)