Crossword Genius

It’s an unfortunate mark (5)

Ross

I believe the answer is:

stain

'mark' is the definition.
(synonyms)

'it's an unfortunate' is the wordplay.
'unfortunate' indicates an anagram.
'its'+'an'='itsan'
'itsan' is an anagram of 'STAIN'.

(Other definitions for stain that I've seen before include "Discoloration" , "Smear" , "Unsightly mark" , "Discolouration" , "Penetrative dye; mark" .)

I've seen this clue in The Mirror.
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