Herbivore set on eating pie (5)

I believe the answer is:

tapir

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

'herbivore' is the definition.
The answer and definition can be both animals as well as being singular nouns.
Maybe there's an association between them I don't understand?

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for tapir that I've seen before include "creature" , "Long-nosed, hoofed mammal" , "Nocturnal mammal with a short flexible proboscis" , "Browser" , "Nocturnal hoofed animal" .)

I've seen this clue in The Times and The Sunday Times.

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