Weakens (4)

I believe the answer is:

saps

'weakens' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for saps that I've seen before include "Enervates in spas" , "trenches" , "Vital juices" , "mugs" , "Depletes the the strength of fools" .)

I've seen this clue in The Mirror, the King Feature Syndicate, the USA Today, the Evening Standard and the LA Times.

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