Crossword Genius

Almost spear adult beast (6)

Ross

I believe the answer is:

impala

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

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

Can you help me to learn more?

(Other definitions for impala that I've seen before include "Spectacular jumper" , "prodigious bounder" , "Leaping antelope" , "horned beast" , "Big game" .)

I've seen this clue in The Independent.
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