Crossword Genius

Money returned — woof! (3)

Ross

I believe the answer is:

yap

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'woof' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.

'money returned' is the wordplay.
'money' becomes 'pay' (I've seen this in other clues).
'returned' says the letters should be written backwards.
'pay' in reverse letter order is 'YAP'.

Can you help me to learn more?

(Other definitions for yap that I've seen before include "High-pitched bark" , "Bark incessantly" , "Pay up for chatter" , "Natter; small dog's bark" , "Bark sharply" .)

I've seen this clue in The Guardian.
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