Extra dedicated housing marketed (6)
I believe the answer is:
traded
'marketed' is the definition.
(to market is to trade or sell)
'extra dedicated housing' is the wordplay.
'housing' indicates a hidden word (part of the clue houses the answer).
'TRADED' is hidden in the letters of 'extra dedicated'.
(Other definitions for traded that I've seen before include "Did business, bought and sold" , "Dealt" , "Bought and sold goods" , "Engaged in commerce" , "Exchanged, bartered" .)