Crossword Genius

Jaguar darted when uncaged (5)

Ross

I believe the answer is:

ounce

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'jaguar' is the definition.
(I've seen this before)

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

Can you help me to learn more?

(Other definitions for ounce that I've seen before include "one of a number in the pound" , "prowler" , "Small unit of weight" , "Small quantity - weight" , "One cat" .)

I've seen this clue in The Telegraph.
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