Oxygen, for one (7)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">oxygen for one</span>' is the definition.<br/ ><span class="explanation-format__explanation">(oxygen is a kind of element)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for element that I've seen before include "part of cooker" , "Constituent of universe" , "Constituent part (7)" , "part of a toaster" , "Fundamental part of whole" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">oxygen for one</span>' is the definition.<br/ ><span class="explanation-format__explanation">(oxygen is a kind of gas)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for gas that I've seen before include "Americans' petrol" , "Chatter (colloq.)" , "Nitrogen, say" , "What's needed to drive" , "Petrol (US)" .)