Go or come back (6)
I believe the answer is:
return
This clue is a double definition.
'go' is the first definition.
(I know that return is a type of return)
'come back' is the second definition.
(synonyms)
(Other definitions for return that I've seen before include "hit back?" , "second half of journey" , "Reappear" , "get back to original state" , "Send, bring or come back" .)