Relating to plants (9)
I believe the answer is:
botanical
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">relating to plants</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 botanical that I've seen before include "(Gardens) of scientific interest" , "Relating to the study of plants" , "Description of some gardens" .)