Sitting among possessions (7)
I believe the answer is:
session
'sitting' is the definition.
('session' can be a synonym of 'sitting')
'among possessions' is the wordplay.
'among' says the answer is hidden in the clue.
'SESSION' is hidden within 'possessions'.
(Other definitions for session that I've seen before include "Meeting devoted to a particular purpose" , "- Aquinas; - a Becket" , "Studio recording period" , "Parliamentary period" , "Hearing, sitting" .)