Girl made grand in swindle over small amount (9)
I believe the answer is:
doolittle
'girl made grand' is the definition.
(I've seen this before)
'in swindle over small amount' is the wordplay.
'in' indicates putting letters inside.
'swindle' becomes 'do'.
'over small' becomes 'o' (cricket abbreviation; 'small' suggests a short form).
'amount' becomes 'little' (little is a kind of amount).
'do' placed around 'o' is 'doo'.
'doo'+'little'='DOOLITTLE'
(Other definitions for doolittle that I've seen before include "Eliza ---, Higgins's pupil (G. B. Shaw)" , "flower seller" , "dustman" , "Girl made grand" , "Cockney Eliza" .)