Bag antique chamber pots (7)
I believe the answer is:
holdall
'bag' is the definition.
(holdall is a kind of bag)
'antique chamber pots' is the wordplay.
'antique' becomes 'old' (similar in meaning).
'chamber' becomes 'hall' (I've seen this before).
'pots' is an insertion indicator (pot can mean to contain).
'old' placed into 'hall' is 'HOLDALL'.
(Other definitions for holdall that I've seen before include "Large carrying bag" , "Large bag (no need for another?)" , "Big bag" , "Item of luggage" , "Large strong bag with handles or shoulder strap" .)