Take away on go? (6)
I believe the answer is:
remove
'take away' is the definition.
(synonyms)
'on go?' is the wordplay.
'on' becomes 're' ('on' can be mean 'with reference to').
'go?' becomes 'move' (going is a kind of moving).
're'+'move'='REMOVE'
(Other definitions for remove that I've seen before include "class in a number of schools" , "Take away, dispose of" , "Subtract" , "Take something away" , "Get rid of, take away (6)" .)