Reckless speed (5)
I believe the answer is:
haste
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">reckless speed</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for haste that I've seen before include "The more of it, the less speed, it is said" , "Speed, hurry" , "Excessive speed or urgency" , "Inconsiderate speed" , "Speediness or rush" .)