First-rate wings of divine assistant (4)
I believe the answer is:
aide
'assistant' is the definition.
(aide is a kind of assistant)
'first-rate wings of divine' is the wordplay.
'first-rate' becomes 'ai' (resembles A1, informal term for excellent).
'wings of' means to remove the middle letters (letters on the two wings removed).
'divine' with its centre removed is 'de'.
'ai'+'de'='AIDE'
(Other definitions for aide that I've seen before include "someone in assistance" , "Personal assistant in the military" , "Right-hand man/woman" , "auxiliary" , "Somebody helping" .)