Crossword Genius

A cry of approval (4)

Ross

I believe the answer is:

hear

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'cry of approval' is the definition.
Although both the answer and definition are verbs in their base form, I cannot understand how one could define the other.

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

Can you help me to learn more?

(Other definitions for hear that I've seen before include "to judge" , "Perceive aurally" , "receive information" , "Get wind of" , "Catch" .)

I've seen this clue in The Irish Independent.
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