Plants of wetlands (6)
I believe the answer is:
rushes
'plants of wetlands' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for rushes that I've seen before include "Overcharges" , "Wetland plants" , "Hurries to the river grasses" , "Moves hastily" , "Grasslike plants in wet places" .)