Snoozed and left in a month (5)
I believe the answer is:
slept
'snoozed' is the definition.
(I've seen this in another clue)
'left in a month' is the wordplay.
'left' becomes 'l' (common abbreviation).
'in' indicates putting letters inside.
'a month' becomes 'sept' (Sept is an example).
'l' put inside 'sept' is 'SLEPT'.
'and' is the link.
(Other definitions for slept that I've seen before include "Slumbered" , "Snoozed" , "Had room for" , "appeared still" , "Was dormant" .)