Crossword Genius

Behind (in America) (informal) (4)

Ross

I believe the answer is:

butt

(Other definitions for butt that I've seen before include "Victim of ridicule" , "Bottom end of a rifle" , "Cigar end" , "one ridiculed" , "Scapegoat - strike - bottom - barrel" .)

I've seen this clue in The Guardian.
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