Massive herbivorous hoofed animal (abbr) (5)

I believe the answer is:

rhino

(Other definitions for rhino that I've seen before include "Horned creature" , "Dosh (slang)" , "wild beast" , "Thick-skinned animal (abbr) - money (slang)" , "Large horned mammal" .)

I've seen this clue in The Guardian.

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