Plantain lily (5)
I believe the answer is:
hosta
'plantain lily' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for hosta that I've seen before include "leafy plant" , "Garden plant with ornamental foliage" , "Plant grown for foliage" , "Ornamental foliage plant; as hot (anag.)" , "found in a bed, perhaps" .)