Society girl (3)
I believe the answer is:
deb
'society girl' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for deb that I've seen before include "Young woman making her first appearance in society, in short" , "In brief, a society girl getting out of bed" , "Girl just entering society" , "One coming out" , "Young socialite" .)