Ventilates sari, perhaps (4)
I believe the answer is:
airs
'ventilates' is the definition.
('air' can be a synonym of 'ventilate')
'sari perhaps' is the wordplay.
'perhaps' is an anagram indicator.
'sari' with letters rearranged gives 'AIRS'.
(Other definitions for airs that I've seen before include "affectation of superiority" , "'Tunes, melodies (4)'" , "Attitudes or tunes" , "Strain's" , "Tunes and posturings" .)