She makes a cash collection (5)
I believe the answer is:
kitty
'collection' is the definition.
(I have seen 'Collection of money' mean 'kitty' so perhaps 'collection' could also mean 'kitty')
'she makes a cash' is the wordplay.
'she' becomes 'Kit'.
'makes a cash' becomes 'ty' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'kit'+'ty'='KITTY'
Can you help me to learn more?
(Other definitions for kitty that I've seen before include "potential winnings" , "Common pool of money" , "Pool - Katharina?" , "Cat; fund of money" , "Collection of money" .)