Timber business? (4)
I believe the answer is:
deal
This clue is a double definition.
'timber' is the first definition.
(I know that deal is a type of board)
'business?' is the second definition.
(thesaurus)
(Other definitions for deal that I've seen before include "Agreement; soft wood" , "Business transaction of timber." , "Distribute playing cards" , "Distribute cards or do business" , "Bargain, contract" .)