Requiring speedy action (6)
I believe the answer is:
urgent
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">requiring speedy action</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 urgent that I've seen before include "In need of immediate action" , "Needing immediate action" , "Requiring immediate attention" , "Requiring immediate action" , "Pressing, burning" .)