LIAR

Person regularly 'economical with the truth' (4)

Solution has appeared in 3 crosswords (2 across and 1 down):

• Quick crossword No 16,332 — 2022-09-09 23:00:46
  20A: One whose word cannot be trusted (4)
• Quick crossword No 16,185 — 2022-03-23 00:00:14
  3D: Porky pie teller (4)
• Quick crossword No 15,240 — 2019-03-13 00:00:00
  21A: Person regularly 'economical with the truth' (4)