Does it constitute mountain air? (5)

I believe the answer is:

yodel

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'mountain air?' is the definition.
(I've seen this in another clue)

I don't understand how the remainder of the clue works.

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(Other definitions for yodel that I've seen before include "mountain air?" , "Sing in Tyrolean fashion" , "Alpine mountain call" , "Swiss warble" , "Alpine song or call" .)

I've seen this clue in The Sun.

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