Boy and girl eating cheese (7)
I believe the answer is:
gabriel
'boy' is the definition.
(I've seen this before)
'girl eating cheese' is the wordplay.
'girl' becomes 'gal' ('gal' can be a synonym of 'girl').
'eating' is an insertion indicator.
'cheese' becomes 'brie' (Brie is an example).
'gal' going around 'brie' is 'GABRIEL'.
'and' acts as a link.
(Other definitions for gabriel that I've seen before include "Boy" , "The angel with a trumpet" , "Dante - Rossetti, nineteenth century English poet/painter" , "Archangel who plays the trumpet" , "Man'" .)