Never a one (4)
I believe the answer is:
none
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">never a one</span>' is the definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for none that I've seen before include "Zero" , "Nobody - nothing" , "Bugger all" , "0?" , "Not a thing or person" .)