Stay longer abed (3,2)
I believe the answer is:
lie in
'stay longer abed' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for lie in that I've seen before include "An extended stay in bed" , "Stay in bed, be a lazybones" , "delay rise" , "Protracted stay in bed" , "Still be in bed" .)