1) An insane person 2) British eccentric 3) British slang for a lunatic 4) Eccentric 5) Eccentric person 6) Flake 7) Geek 8) Madman 9) Oddball 10) One who gathers pecans 11) Slang for lunatic 12) Wacko 13) Whacko Found on https://www.crosswordclues.com/clue/nutter