Helping pretty girl work (6)
I believe the answer is:
dollop
'helping' is the definition.
(I've seen this before)
'pretty girl work' is the wordplay.
'pretty girl' becomes 'doll'.
'work' becomes 'op' (abbreviation for opus).
'doll'+'op'='DOLLOP'
(Other definitions for dollop that I've seen before include "Squidgy lump (of food)" , "Large shapeless lump" , "Large piece" , "Small shapeless mass" , "serving food, perhaps" .)