Group of organisms (7)
I believe the answer is:
species
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">group of organisms</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for species that I've seen before include "Sort, type" , "Taxonomic group whose members can interbreed" , "Variety, taxonomic group" , "Breed or genus" , "Kind of creature" .)