Crossword Genius

Shout rebounds within valley (4)

Ross

I believe the answer is:

yell

'shout' is the definition.
(yelling is a kind of shouting)

I cannot understand how the rest of the clue works.

(Other definitions for yell that I've seen before include "Shetland isle" , "Howl" , "Shout - Shetland island" , "Loud sharp cry" , "Loud utterance" .)

I've seen this clue in The Guardian.
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