Crossword Genius

Doesn’t stand for untruths (4)

Ross

I believe the answer is:

lies

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'for untruths' is the definition.
(lie is a kind of untruth)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for lies that I've seen before include "Assumes a horizontal position" , "Deceits; is" , "Wallows" , "Falsehood" , "False statements" .)

I've seen this clue in The Mirror.
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