Neaten (4)
I believe the answer is:
tidy
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">neaten</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for tidy that I've seen before include "Well-groomed" , "Neat - container for odds and ends" , "In good order" , "Systematic; substantial" , "Substantial - orderly" .)