Young socialite going back to bed (3)
I believe the answer is:
deb
'young socialite' is the definition.
(I've seen this before)
'going back to bed' is the wordplay.
'going back' says the letters should be written in reverse.
'bed' back-to-front is 'DEB'.
(Other definitions for deb that I've seen before include "Young woman coming out in society, in short" , "Young woman making her first appearance in society, in short" , "Young socialite" , "One coming out" , "In brief, a society girl getting out of bed" .)