Crossword Genius

Floor or platform for speaker (5)

Ross

I believe the answer is:

stump

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

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for stump that I've seen before include "Tree remnant; baffle" , "Component of wicket" , "Cricket stick" , "defeat" , "Remains of tree - puzzle" .)

I've seen this clue in The Times.
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