Crossword Genius

Cat under pressure will jump (5)

Ross

I believe the answer is:

ounce

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'cat' is the definition.
(ounce is a kind of cat)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for ounce that I've seen before include "Unit of weight; cat" , "A little bit" , "28.3495 grammes" , "On cue (anag.)" , "weight? Surely not" .)

I've seen this clue in The Hindu.
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