Crossword Genius

Hey Derek! Make an off-peak call? (5)

Ross

I believe the answer is:

yodel

I'm a little stuck... Click here to teach me more about this clue!

'peak call?' is the definition.
(I've seen this in another clue)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for yodel that I've seen before include "Vocalise" , "Sing in high pitch like Swiss mountain dwellers" , "Sing by alternating between normal voice and falsetto" , "Sing in Tyrolean fashion" , "Loftily call" .)

I've seen this clue in The Sun and The Telegraph.
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