Popular pot plant (8)
I believe the answer is:
geranium
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">popular pot plant</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for geranium that I've seen before include "Common garden or house plant" , "Flower confused with pelargonium" , "Cultivated flower often seen in window box" , "Pelargonium (loosely)" , "Herbaceous plant" .)