Not fancy (5)
I believe the answer is:
plain
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">not fancy</span>' is the definition.<br/ ><span class="explanation-format__explanation">('plain' is the opposite to 'fancy')</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for plain that I've seen before include "Simply" , "stretch of level land" , "Ordinary; flat region" , "Unembellished" , "Unattractive - flat" .)