Token opposition action? (7)
I believe the answer is:
counter
This clue could be a double definition.
'token' is the first definition.
(counter can mean a token or chip)
'opposition action?' is the second definition.
'counter' can be an answer for 'action?' (counter is a kind of action). I am unsure of the 'opposition' bit.
Can you help me to learn more?
(Other definitions for counter that I've seen before include "part of stern" , "Small game disc; oppose" , "Pawn" , "Trounce (anag.)" , "Respond with another argument" .)