Crossword Genius

Worry sweet dog's been stolen (4)

Ross

I believe the answer is:

fret

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'worry' is the definition.
(fretting is a kind of worrying)

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

Can you help me to learn more?

(Other definitions for fret that I've seen before include "Anguish" , "Wear away" , "Be constantly anxious" , "Worry - pine" , "Vex oneself - part of a fingerboard" .)

I've seen this clue in The Telegraph.
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