Crossword Genius

Something to whistle (4)

Ross

I believe the answer is:

tune

'something to whistle' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for tune that I've seen before include "Of engine, adjust to run smoothly" , "temper" , "Air, melody" , "Adjust a radio receiver to a frequency" , "Song" .)

I've seen this clue in The New York Times.
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