Orifice (4)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">orifice</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that vent is a type of orifice)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for vent that I've seen before include "Orifice" , "Air passage" , "Opening for air/gas" , "Volcanic opening" , "Broadcast" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">orifice</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for aperture that I've seen before include "Opening, gap" , "Hole, gap" , "Eye" , "Opening, to let light enter a camera perhaps" , "Opening (for a photographer?)" .)