It's not true rest (3)

I believe the answer is:

lie

I believe this is a double definition.

'it's not true' is the first definition.
(lies are false or untrue)

'rest' is the second definition.
(I know that rest is a more specific form of the action recline)

(Other definitions for lie that I've seen before include "Be prone - misrepresent the facts" , "buried" , "Porky" , "Fib in alienation" , "Assume a horizontal position" .)

I've seen this clue in The Times.

Want a hint initially instead of a full solution? Install my app