Most fashionable (9)
I believe the answer is:
trendiest
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">most fashionable</span>' is the definition.<br/ ><span class="explanation-format__explanation">('trendy' can be similar in meaning to 'fashionable')</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for trendiest that I've seen before include "cooler than the rest" , "Most cool!" , "Most popular" .)