Go round, or simply go (4)
I believe the answer is:
turn
This clue could be a double definition.
'go round' is the first definition.
(both can mean to rotate)
'simply go' is the second definition.
'turn' can be an answer for 'go' (as in one's go or turn in a game). I'm not sure about the 'simply' bit.
'or' is the link.
Can you help me to learn more?
(Other definitions for turn that I've seen before include "Rotate - diverge - change" , "Go off - performance" , "Revolution by runt" , "roll" , "rotation" .)