Social worker, girl coming back: dish? (7)
I believe the answer is:
antenna
'dish?' is the definition.
(as in a satellite dish)
'social worker girl coming back' is the wordplay.
'social worker' becomes 'ant' (I've seen this in another clue).
'girl' becomes 'anne' (girl's name).
'coming back' shows that the letters should be reversed in order.
'anne' back-to-front is 'enna'.
'ant'+'enna'='ANTENNA'
(Other definitions for antenna that I've seen before include "What detects signals" , "Insect's feeler" , "Aerial - insect feeler" , "Feeling part" , "sensitive feeler" .)