Crossword Genius

First-class rook in sky (3)

Ross

I believe the answer is:

air

'sky' is the definition.
(I've seen this in another clue)

'first-class rook' is the wordplay.
'first class' becomes 'ai' (A1 - top quality).
'rook' becomes 'R' (chess abbreviation).
'ai'+'r'='AIR'

'in' acts as a link.

(Other definitions for air that I've seen before include "Skye Boat Song, perhaps" , "Ventilate, give voice to" , "Broadcast; express" , "Tune; mien" , "The earth's atmosphere" .)

I've seen this clue in The Sun.
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