Most ventilated (7)
I believe the answer is:
airiest
'most ventilated' is the definition.
('airy' can be similar in meaning to 'ventilated')
This is the entire clue.
(Other definitions for airiest that I've seen before include "Breeziest" , "most visionary" , "Best ventilated" .)
I've seen this clue in The Guardian.
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