Gangster’s girl wanting some more money (4)
I believe the answer is:
moll
'gangster's girl' is the definition.
(I've seen this before)
'some more money' is the wordplay.
'some more' becomes 'mol' (I can't justify this - if you can you should give a lot more credence to this answer).
'money' becomes 'l' (L can mean 'pounds').
'mol'+'l'='MOLL'
'wanting' acts as a link.
Can you help me to learn more?
(Other definitions for moll that I've seen before include "Gangster's girlfriend" , "Gangster's female companion" , "Hood's girl" , "Gangster's tart" , "Book by Defoe" .)