Tropical grass with strong hollow stems (6)
I believe the answer is:
bamboo
'tropical grass with strong hollow stems' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for bamboo that I've seen before include "Tropical grass/wood" , "Panda's staple diet" , "Treelike tropical grass" , "'Tall, rigid grass (6)'" , "Panda's dinner?" .)