Rest needed by stand-up? Just the opposite (3,4)

I believe the answer is:

lie down

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'rest' is the definition.
(to lie down is to have a short rest)

I don't understand the remainder of the clue.

(Other definitions for lie down that I've seen before include "Take to one's bed" , "Put your feet up" , "Take rest; be submissive (under)" , "Short rest on a bed" , "Rest in a horizontal position" .)

I've seen this clue in The Guardian.

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