Pass, as time spent asleep, maybe (6)
I believe the answer is:
elapse
'pass as time' is the definition.
(I've seen this in another clue)
'asleep maybe' is the wordplay.
'maybe' indicates anagramming the letters.
'asleep' anagrammed gives 'ELAPSE'.
'spent' is the link.
This may not be right. It may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for elapse that I've seen before include "Pass away - asleep (anag)" , "Of time, pass by - please" , "Tick by" , "Glide by" , "'Pass by, as time (6)'" .)