What remains of a public speaking platform (5)

I believe the answer is:

stump

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'platform' is the definition.
(I know that stump is a type of platform)

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

Can you help me to learn more?

(Other definitions for stump that I've seen before include "Remains of tree - puzzle" , "Wooden leg" , "What's left after cutting" , "A single wicket" , "Remains of felled tree" .)

I've seen this clue in The Guardian.

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