Neatest (7)
I believe the answer is:
tidiest
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">neatest</span>' is the definition.<br/ ><span class="explanation-format__explanation">('tidy' can be a synonym of 'neat')</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for tidiest that I've seen before include "One orderly more than others" , "smarter than anything" , "optimally arranged" , "most trim" , "Neatest" .)