Wackadoodle
(Other definitions for weirdo that I've seen before include "Slang for odd or eccentric person" , "Person who behaves bizarrely" , "An eccentric (sl.)" , "Crank - oddball" , "Eccentric type" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">wackadoodle</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for nut that I've seen before include "Screwball" , "Fruitcake" , "Freak" , "Brazil, for instance" , "Crazy person" .)