"That's gonna leave a ___!" Crossword Clue

To have a long-lasting negative impact on (someone or something).

An anagram of the answer is "KMAR"

Can also mean "MK", "MK.", "HEED", "OBSERVANCE", "BLEMISH", "SCAR", "SCRATCH", "STAIN", "CHARACTERIZE", "TYPIFY", "CLASSIFY", "COMMEMORATE", "SOLEMNIZE", "DEMONSTRATE", "INDICATE", "MANIFEST", "REVEAL", "SHOW", "SIGNAL", "DESTINE", "TARGET", "DISPLAY", "SHOW", "WRITE", "DRAW", "TRACE", "GRADE", "SCORE", "HEAR", "NOTE", "NOTICE", "OBSERVE", "PERCEIVE", "SEE", "HEED", "LISTEN TO", "LOOK AT", "OBSERVE", "WATCH", "REPRESENT", "SEE"

Another clue for the same answer is Con artist's victim

The first letter of the answer is "M"