Once more go and reciprocate (6)
I believe the answer is:
return
'reciprocate' is the definition.
(I know that return is a more specific form of reciprocate)
'once more go' is the wordplay.
'once more' becomes 're' (prefix in words like 're-emerge' or 're-enter').
'go' becomes 'turn' (as in one's go or turn in a game).
're'+'turn'='RETURN'
'and' acts as a link.
(Other definitions for return that I've seen before include "Send, bring or come back" , "Comeback" , "Key on computer" , "Proceeds" , "get back to original state" .)