Cast-iron plant (10)
I believe the answer is:
aspidistra
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">cast-iron plant</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for aspidistra that I've seen before include "leafy plant" , "For Asian native" , "Star is paid (anag) - plant" , "Household growth" , "Huge house plant" .)