Marsupial's time in sleeping place (5)
I believe the answer is:
roost
'sleeping place' is the definition.
(thesaurus)
'marsupial's time' is the wordplay.
'marsupial's' becomes 'roo's' (short for kangaroo).
'time' becomes 't' (abbreviation).
'roos'+'t'='ROOST'
'in' acts as a link.
(Other definitions for roost that I've seen before include "Torso (anag)" , "settle for a nap" , "Perch where bird sleeps" , "Bird's night spot" , "In Orkney, the current" .)