Crossword Genius

Thick-skinned beast (5)

Ross

I believe the answer is:

hippo

(Other definitions for hippo that I've seen before include "Aquatic creature" , "One wallows in mud" , "one that's large and fleshy" , "Massive thick-skinned animal of African rivers" , "Large semi-aquatic mammal (abbr)" .)

I've seen this clue in The Sun.
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