Go, flow (4)
I believe the answer is:
pass
This clue is a double definition.
'go' is the first definition.
(I know that go can be written as pass)
'flow' is the second definition.
(thesaurus)
(Other definitions for pass that I've seen before include "Exceed; go by" , "Ratify for saps" , "good performance by exam candidate" , "Go by; succeed in (an exam)" , "Narrow route through high mountain, like the Khyber" .)