Property found in toilet at Selfridges returned (6)
I believe the answer is:
estate
'property' is the definition.
(estate is a kind of property)
'in toilet at selfridges returned' is the wordplay.
'in' says the answer is hidden in the clue.
'returned' says the letters should be written backwards.
'etatse' is hidden in the letters of 'toilet at selfridges'.
'etatse' back-to-front is 'ESTATE'.
'found' is the link.
(Other definitions for estate that I've seen before include "Car with a rear door" , "Extent of one's property" , "Property - may go with rank" , "Nakedness" , "Scheme of new housing" .)