Crossword Genius

Sound from stage floor (4)


I think it could be either:


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'floor' is the definition.
(I know that floor can be written as base)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for base that I've seen before include "'Foundation, bottom (4)'" , "This underlying structure" , "Foot; ignoble" , "Ignoble; bottom" , "Low and contemptible" .)

I've seen this clue in The Sun.
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