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Swine, the boxer, having change of heart (3)

Ross

I believe the answer is:

pig

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'swine' is the definition.
(pig is a kind of swine)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for pig that I've seen before include "Hog" , "Farmyard animal" , "Porcine animal" , "Eat greedily" , "person who eats too much" .)

I've seen this clue in The Times.
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