Dry or with fine rain (3)
I believe the answer is:
air
'dry' is the definition.
(airing is a kind of drying)
'with fine rain' is the wordplay.
'with' is a charade indicator (letters next to each other).
'fine' becomes 'ai' (resembles Ar, informal term for top quality).
'rain' becomes 'r' (this could be a standard abbreviation which I don't know about).
'ai' next to 'r' is 'AIR'.
'or' acts as a link.
Can you help me to learn more?
(Other definitions for air that I've seen before include "14" , "Atmosphere surrounding us" , "An impressive manner or tune" , "Simple melody's" , "Outward appearance" .)