An angel, girl entertaining barrister fellow rejected (7)
I believe the answer is:
gabriel
'an angel' is the definition.
(I've seen this before)
'girl entertaining barrister fellow rejected' is the wordplay.
'girl' becomes 'gal' ('gal' can be a synonym of 'girl'**).
'entertaining' is an insertion indicator.
'barrister' becomes 'brief' (I've seen this before).
'fellow' becomes 'f' (abbreviation - of a society etc.).
'rejected' indicates named letters should be taken away.
'brief' with 'f' removed is 'brie'.
'gal' enclosing 'brie' is 'GABRIEL'.
(Other definitions for gabriel that I've seen before include "The angel with a trumpet" , "Boy" , "Archangel and messenger of God" , "Dante - Rossetti, nineteenth century English poet/painter" , "Archangel who plays the trumpet" .)