Cowl (4)
I believe the answer is:
hood
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">cowl</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that cowl can be written as hood)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for hood that I've seen before include "Bonnet (US) - gangster (US)" , "Capital cover" , "See 8" , "Protective cover - violent criminal (slang)" , "Head covering or American car bonnet" .)