Crossword Genius

Proper moisture on the air (3)

Ross

I believe the answer is:

due

'proper' is the definition.
(what is due is what is proper or appropriate)

'moisture on the air' is the wordplay.
'moisture' becomes 'dew' (I have seen 'Overnight moisture ' mean 'dew' so perhaps 'moisture' could also mean 'dew').
'on the air' shows a homophone (sound like).
'dew' is a homophone of 'DUE'.

(Other definitions for due that I've seen before include "Scheduled to arrive" , "deserts" , "Expected; appropriate" , "Deserved or unpaid" , "Ripe for payment or arrival" .)

I've seen this clue in The Guardian.
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