Timber transaction (4)
I believe the answer is:
deal
I believe this clue is a double definition.
'timber' is the first definition.
(deal is a kind of timber)
'transaction' is the second definition.
(deal is a kind of transaction)
(Other definitions for deal that I've seen before include "Soft wood; trade" , "Distribute cards or do business" , "Lead out of the pine wood" , "Share out (cards); wood" , "Bargain or kind of wood" .)