Carnivore after meat joint gets stomach upset (4)
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" .)