"Little" Dickens girl (4)
I believe the answer is:
nell
'little dickens girl' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for nell that I've seen before include "-- Gwyn, mistress of Charles II" , "Orphan girl" , "Little -, (Dickens char.)" , "Dickensian heroine" , "- - Gwynne" .)