Most tardy (6)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">most tardy</span>' is the definition.<br/ ><span class="explanation-format__explanation">('late' can be a synonym of 'tardy')</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for latest that I've seen before include "style of today" , "Most recent (news)" , "most behind time" , "Most recent or most tardy" , "Most up to the minute" .)
(Other definitions for slowest that I've seen before include "Most stupid" , "Least fast" , "Last in race" .)