Environmentalist (7)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">environmentalist</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 greenie that I've seen before include "Environmental campaigner" , "Environmentalist" , "Environment campaigner (colloquial)" , "conservationist, rudely" , "Australian conservationist" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">environmentalist</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 ecologist that I've seen before include "Environmentalist" , "One concerned with the environment" , "Studier of organisms and the environment" , "See scientist" , "One studying the relation between organisms and their environment" .)