Go and act (4)
I believe the answer is:
turn
I believe this is a double definition.
'go' is the first definition.
(as in one's go or turn in a game)
'act' is the second definition.
(theatre)
'and' acts as a link.
(Other definitions for turn that I've seen before include "Sour" , "Start" , "fit" , "Rotate - go" , "Shape (using a lathe)" .)