Green hazard (4)
I believe the answer is:
trap
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">green hazard</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 trap that I've seen before include "Part of a snare" , "It commonly has a role in speaking" , "ladder" , "that may be sprung?" , "Snare; pony carriage" .)