Kilmer poem (5)
I believe the answer is:
trees
'kilmer poem' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for trees that I've seen before include "Steer into the plants" , "Large plants" , "Ashes, perhaps?" , "''I see ... of green / Red roses too'' (What a Wonderful World)" , "Elms, pines etc" .)