Crossword Genius

First-class resistance song (3)

Ross

I believe the answer is:

air

'song' is the definition.
(thesaurus)

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

(Other definitions for air that I've seen before include "Cool" , "Element; tune" , "Lay" , "Atmosphere surrounding us" , "Atmosphere (of a melody?)" .)

I've seen this clue in The Independent.
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