Ventilates sari, possibly (4)
I believe the answer is:
airs
'ventilates' is the definition.
('air' can be a synonym of 'ventilate')
'sari possibly' is the wordplay.
'possibly' indicates an anagram.
'sari' with letters rearranged gives 'AIRS'.
(Other definitions for airs that I've seen before include "feelings" , "Arrogance" , "Ventilates or tunes" , "Broadcasts" , "Haughty affectation" .)