Fronded plants (5)
I believe the answer is:
ferns
'fronded plants' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for ferns that I've seen before include "Flowerless plants with feathery or leafy fronds" , "Frondy plants" , "Plant, maidenhair or tree say" , "Flowerless plants with feathery green leaves" , "Ancient plants" .)