Pass, as error by East (6)
I believe the answer is:
elapse
'pass' is the definition.
(I've seen this before)
'error by east' is the wordplay.
'error' becomes 'lapse' (lapse is a kind of error**).
'by' means one lot of letters go next to another.
'east' becomes 'e' ('E' can be a synonym of 'east').
'lapse' after 'e' is 'ELAPSE'.
'as' is the link.
(Other definitions for elapse that I've seen before include "run by" , "'Pass by, as time (6)'" , "Of time, pass by - please" , "Go past" , "Tick by" .)