Perjurer (4)
I believe the answer is:
liar
'perjurer' is the definition.
(a perjurer lies in court)
This is all the clue.
(Other definitions for liar that I've seen before include "one telling a story" , "Tale-teller" , "Pinocchio, at times" , "27 [DECEIVER]" , "Story teller?" .)