Crossword Genius

Carnivore after meat joint gets stomach upset (4)

Ross

I believe the answer is:

lion

'carnivore' is the definition.
(lion is a kind of carnivore)

I cannot understand how the remainder of the clue works.

(Other definitions for lion that I've seen before include "cowardly character in Oz" , "Leo" , "Large cat; rugby player" , "Large predatory feline" , "Cowardly visitor in Oz" .)

I've seen this clue in The Times.
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