Money-box? (3)
I believe the answer is:
tin
This clue is a double definition.
'money' is the first definition.
(old-fashioned slang term for money)
'box?' is the second definition.
(I've seen this in other clues)
(Other definitions for tin that I've seen before include "Silver-white element often used in food containers" , "Silvery white metal" , "Silvery metallic element" , "Metal in Argentina" , "Canister" .)