Plant of the heath genus (5)
I believe the answer is:
erica
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">plant of the heath genus</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 erica that I've seen before include "Female" , "Moorland plant, girl's name" , "Woman" , "Heath genus; girl's name" , "found on the moors" .)