Handy to have tin for cash (5,5)
I believe the answer is:
ready money
'cash' is the definition.
(I've seen this before)
'handy to have tin' is the wordplay.
'handy to have' becomes 'ready' (I can't justify this - if you can you should give a lot more credence to this answer).
'tin' becomes 'money' (I've seen this before).
'ready'+'money'='READY MONEY'
'for' is the link.
Can you help me to learn more?
(Other definitions for ready money that I've seen before include "Means of immediate payment" , "Cash easily available" .)