Herb — girl's name (8)
I believe the answer is:
rosemary
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">herb</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(rosemary is a kind of herb)</span><br/ ><br/ >'<span class="explanation-format__original">girl's name</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ ></span>
(Other definitions for rosemary that I've seen before include "Herb with narrow leaves" , "Helps one to remember" , "Plant" , "Herb - girl's name" , "Herb for remembrance" .)