Crash, with "out" (4)
I believe the answer is:
conk
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">crash with out</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 conk that I've seen before include "Hooter" , "Nose, head (sl.)" , "Blow" , "Nose (colloq.)" , "Nose; break down" .)