Sensitive plant (6)
I believe the answer is:
mimosa
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">sensitive 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 mimosa that I've seen before include "Yellow-flowered acacia tree" , "One growing sensitive" , "Tropical shrub with yellow flowers" , "Sensitive tree or shrub with globular clusters of yellow flowers" , "Australian 15 across" .)