Crossword Genius

Stupid, but he avoids collisions (5)

Ross

I believe the answer is:

crass

(Other definitions for crass that I've seen before include "Boorish about scars" , "Grossly insensitive" , "Witless" , "Grossly stupid, tactless" , "Tactless, boorish" .)

I've seen this clue in The Sun.
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