Fewest (5)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">fewest</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 least that I've seen before include "Superlative form of 'little'" , "Most insignificant" , "superlatively small" , "Lowest amount" , "Most unimportant" .)