Hands over change (4)
I believe the answer is:
swap
'change' is the definition.
(I know that change is a is a kind of of swap)
'hands over' is the wordplay.
'hands' becomes 'paws' ('paw' can be a synonym of 'hand').
'over' says the letters should be written backwards.
'paws' reversed gives 'SWAP'.
(Other definitions for swap that I've seen before include "Exchange goods" , "Exchange, substitute" , "Substitute' feet backwards" , "Exchange; hands back" , "exchanged item" .)