Crossword Genius

Campaign strategy (5)

Ross

I believe the answer is:

smear

(Other definitions for smear that I've seen before include "Unwarranted accusation" , "Dirty mark; a libel" , "Greasy or sticky mark" , "Slur - may be studied microscopically" , "False accusation; blur" .)

I've seen this clue in The Wall Street Journal.
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