Spear antelope, eradicating last on earth (6)

I believe the answer is:

impale

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'spear' is the definition.
(I know that spear has the is a more specific form of the action impale)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for impale that I've seen before include "Kill by piercing with a sharp stake" , "transfix with sharp item" , "Transfix with spear" , "go through with it" , "Fix as on a sharp stick" .)

I've seen this clue in The Independent.

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