Big cats that can be found in pounds (6)

I believe the answer is:

ounces

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

I can't explain the remainder of the clue.

(Other definitions for ounces that I've seen before include "There are 12 in a pound" , "Undomesticated cats" , "Twelfths of a pound" , "parts of pound" , "less than a pound?" .)

I've seen this clue in The Irish News.

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