Snow leopard's attack quietly carried out (5)

I believe the answer is:

ounce

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'snow leopard's' is the definition.
(ounce is an alternative name for the snow leopard)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for ounce that I've seen before include "prowler" , "Large cat" , "A light imperial measure of weight" , "28.3495 grammes" , "Wild cat or light weight" .)

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