Crossword Genius

Still out of tune? (7)

Ross

I believe the answer is:

airless

I'm a little stuck... Click here to teach me more about this clue!

'still' is the definition.
(I've seen this before)

'of tune?' is the wordplay.
I cannot quite understand how this works, but
'tune?' could be 'air' (air can mean a piece of music) and 'air' is located in the answer.
The remaining letters 'less' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

'out' acts as a link.

Can you help me to learn more?

(Other definitions for airless that I've seen before include "Stifling" , "Lacking ventilation" , "Still" , "Unventilated" , "Not ventilated" .)

I've seen this clue in The Globe and Mail and The Telegraph.
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