Moorland plant (7)
I believe the answer is:
heather
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">moorland plant</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 heather that I've seen before include "that grows up in the Highlands" , "thing seen on the moors" , "Lassie" , "Moorland shrub" , "Evergreen shrub" .)