Tick by (6)
I believe the answer is:
elapse
'tick by' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for elapse that I've seen before include "Passing" , "'Pass by, as time (6)'" , "Please (anag) -- pass away" , "Slip away" , "Of time, pass by - please" .)