Crossword Genius

Revive, removing top a little bit (5)

Ross

I believe the answer is:

ounce

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'little bit' is the definition.
(I've seen this in another clue)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for ounce that I've seen before include "One cat" , "Fraction of a pound" , "Lightweight" , "Jaguar" , "Panther, perhaps" .)

I've seen this clue in The Daily Express.
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