Crossword Genius

Tunes whose arrangement can bring hearty praise (4)

Ross

I believe the answer is:

airs

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'tunes' is the definition.
(air can mean a piece of music)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for airs that I've seen before include "Attitudes or tunes" , "affectation of superiority" , "Tunes and affectations" , "affected demeanour" , "Melodies or artificial manners" .)

I've seen this clue in the Evening Standard.
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