Environmental activist (3-7)
I believe the answer is:
eco-warrior
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">environmental activist</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 eco-warrior that I've seen before include "Activist" , "Zealous environmentalist" , "Militant greenie" .)