Flowerless plant (4)
I believe the answer is:
fern
'flowerless plant' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for fern that I've seen before include "Plant such as bracken" , "Plant reproducing by spores" , "Flowerless plant with feathery green leaves, common on mountains" , "Tracheophyte plant" , "It has feathery or leafy fronds" .)