Deals in new treads (6)
I believe the answer is:
trades
'deals in' is the definition.
('trade' can be a synonym of 'deal in')
'new treads' is the wordplay.
'new' indicates an anagram.
'treads' with letters rearranged gives 'TRADES'.
(Other definitions for trades that I've seen before include "Stared (anag)" , "Swaps - winds" , "Occupations" , "Exchanges, buys or sells" , "will give some folk a living" .)