She hasn't much money (5)
I believe the answer is:
penny
'money' is the definition.
'she hasn't much' is the wordplay.
'she' becomes 'Pen'.
'hasn't much' becomes 'ny' (I can't justify this - if you can you should give a lot more credence to this answer).
'pen'+'ny'='PENNY'
Can you help me to learn more?
(Other definitions for penny that I've seen before include "coin, decimal with 1a [NEW]" , "1p" , "Coin - girl's name" , "The price of a thought" , "one might drop" .)