Teller of falsehoods (4)
I believe the answer is:
liar
'teller of falsehoods' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for liar that I've seen before include "Tale-teller" , "Not a truth-sayer!" , "Person telling stories" , "Rail at a prevaricator" , "Fibber" .)