Excessive urgency (5)
I believe the answer is:
haste
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">excessive urgency</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for haste that I've seen before include "Speed, hurry" , "Possible cause of careless mistakes?" , "Leader abandons modest" , "The more of it, the less speed sometimes" , "Urgency of action" .)