A handy transaction (4)
I believe the answer is:
deal
'transaction' is the definition.
(a deal is a transaction or exchange)
'a handy' is the wordplay.
I cannot quite see how this works, but
'a' is present in the answer.
The remaining letters 'del' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for deal that I've seen before include "Give out (cards)" , "Distribute (cards); pine or fir timber" , "Kent town" , "A port; a (good) amount" , "Agreement; soft wood" .)