Crossword Genius

The beast starts to be hopping mad! (5)

Ross

I believe the answer is:

hippo

I'm a little stuck... Click here to teach me more about this clue!

'the beast' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for hippo that I've seen before include "one that's large and fleshy" , "large African creature" , "Wallowing creature" , "Augustine's place" , "African river mammal" .)

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