Animal came by 'orse, we're told (3,4)

I believe the answer is:

roe deer

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'animal' is the definition.
(type of animal)

I don't understand the rest of the clue.

(Other definitions for roe deer that I've seen before include "Graceful little creature" , "Small species of ungulate" , "how beastly is this!" , "Antlered woodland creature" , "Buck perhaps" .)

I've seen this clue in The Independent.

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