Giant woody grass (6)
I believe the answer is:
bamboo
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">giant 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 "Tropical cane with hollow centres, used for furniture" , "Giant tropical grass" , "Tropical grass with strong hollow stems" , "Heavy tropical cane used in furniture" , "Panda's dinner?" .)