Primitive plant (4)
I believe the answer is:
alga
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">primitive plant</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for alga that I've seen before include "from ore found locally" , "Possibly tangle" , "Simple, non-flowering, aquatic plant" , "Simple plant, plankton or seaweed say" , "Irish moss, for example" .)