Extra time in bed in the morning (3-2)
I believe the answer is:
lie-in
'extra time in bed in the morning' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for lie-in that I've seen before include "Extended bedtime!" , "Extended time in bed in the morning" , "Extra snoozing" , "Period in bed longer than usual" , "That extra hour or so in bed?" .)