Crossword Genius

Off-peak call (5)

Ross

I believe the answer is:

yodel

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'call' is the definition.
(I know that yodel is a type of call)

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

Can you help me to learn more?

(Other definitions for yodel that I've seen before include "Sing warblingly" , "Sing in traditional Swiss manner" , "Sing like the Lonely Goatherd?" , "Sing (Swiss style)" , "Alpine warble" .)

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