Linen salesman returns no outdated clothing (6)
I believe the answer is:
napery
'linen' is the definition.
(napery is a kind of linen)
'salesman returns no outdated clothing' is the wordplay.
'salesman' becomes 'rep' (I've seen this before).
'returns' shows that the letters should be reversed in order.
'no outdated' becomes 'nay' (obsolete or archaic form of 'no').
'clothing' is an insertion indicator.
'rep' in reverse letter order is 'per'.
'per' placed inside 'nay' is 'NAPERY'.
(Other definitions for napery that I've seen before include "Household or table linen" , "Household fourteen across" , "Scots tablecloth" , "Linens for the dining table" , "Heavy white table linen" .)