Go by, as time
I believe the answer is:
elapse
'go by as time' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for elapse that I've seen before include "Go past" , "Please (anag) -- pass away" , "Of time, pass by - please" , "run by" , "'Pass by, as time (6)'" .)