Crossword Genius

An air of simplicity (5)

Ross

I believe the answer is:

ditty

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

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(Other definitions for ditty that I've seen before include "Short simple song" , "Simple tune" , "Air" , "Little tune" , "Light-hearted song" .)

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