Woody grass (6)
I believe the answer is:
bamboo
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">woody grass</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 bamboo that I've seen before include "Treelike tropical grass" , "Tropical cane with hollow centres, used for furniture" , "Tropical grass/wood" , "Panda's dinner?" , "Woody grass plant" .)