Assume a token is dodgy (4,2)
I believe the answer is:
take on
'assume' is the definition.
(I know that assume can be written as take on)
'a token is dodgy' is the wordplay.
'is dodgy' indicates anagramming the letters (a dodgy or wrong order of the letters).
'a'+'token'='atoken'
'atoken' anagrammed gives 'TAKE ON'.
(Other definitions for take on that I've seen before include "Employ or stand up to" , "Employ - undertake - oppose" , "Employ or confront" , "Engage employee or assume responsibility" , "Accept as a challenge" .)