Crossword Genius

Drains baths from the bottom (4)

Ross

I believe the answer is:

saps

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'drains' is the definition.
(sapping is a kind of draining)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for saps that I've seen before include "Weakens, undermines" , "trenches" , "Pass around foolish people" , "Enervates in spas" , "mugs" .)

I've seen this clue in The Independent.
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