Severe traffic jam (8)
I believe the answer is:
gridlock
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">severe traffic jam</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 gridlock that I've seen before include "Extensive traffic jam" , "Traffic jam at intersections" , "Traffic snarl-up" , "road problem" , "Traffic jam where no movement is possible" .)