Most awful (6)
I believe the answer is:
direst
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">most awful</span>' is the definition.<br/ ><span class="explanation-format__explanation">('dire' can be a synonym of 'awful')</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for direst that I've seen before include "Most horrific" , "far from ideal" .)