With the least delay (7)
I believe the answer is:
soonest
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">with the least delay</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for soonest that I've seen before include "'Least said, ... mended (7)'" , "First" , "At the earliest time" , "As early as possible" , "Most readily" .)