Doesn't stand for falsehoods (4)
I believe the answer is:
lies
'for falsehoods' is the definition.
(lie is a kind of falsehood)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for lies that I've seen before include "Tall stories" , "pork pies" , "Is prone" , "False statements" , "Assumes a horizontal position" .)