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Untrustworthy person (4)

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

• Quick crossword No 16,482 — 2023-03-04 00:00:09
  6D: Command given to a dog (4)
• Quick crossword No 15,942 — 2021-06-10 23:00:02
  1A: Command given to a trained dog (4)
• Quick crossword No 15,704 — 2020-09-04 23:00:38
  23D: Untrustworthy person (4)