Also accepted king must go (3)
I believe the answer is:
too
'also' is the definition.
('too' can be a synonym of 'also')
'accepted king must go' is the wordplay.
'accepted' becomes 'took' (I've seen this before).
'king' becomes 'k'.
'must go' indicates named letters should be taken away.
'took' with 'k' removed is 'TOO'.
(Other definitions for too that I've seen before include "Likewise" , "Furthermore" , "Unduly" , "Excessively" , "On top - also" .)