Doesn’t stand for untruths (4)
I believe the answer is:
'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" .)