Not as messy
I believe the answer is:
neater
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">not as messy</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for neater that I've seen before include "More tidy and orderly" , "Tidier" , "More tidy and uncluttered" , "approaching apple-pie order" , "Better" .)