Sing high in the Alps? (5)

I believe the answer is:

yodel

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'sing high' is the definition.
(yodelling is a type of high-pitched singing)

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 "Sing like the Lonely Goatherd?" , "Sing in high pitch like Swiss mountain dwellers" , "Sing in high trilling tone like Swiss mountaineer" , "Sing falsetto like Swiss mountain people" , "Sing in a certain way" .)

I've seen this clue in the Evening Standard.

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