Least amount (7)
I believe the answer is:
minimum
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">least amount</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 minimum that I've seen before include "Lower limit" , "Nadir" , "Bottom" , "Lowest value" , "Least possible quantity" .)