Herbivore with a horn (5)

I believe the answer is:

rhino

(Other definitions for rhino that I've seen before include "Large animal (abbr) - money (slang)" , "Large horned mammal" , "Horned beast (abbr.)" , "Massive mammal with one or two horns on its nose, in short" , "Horned animal; money (slang)" .)

I've seen this clue in The Wall Street Journal.

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