Rushes to get water plants (5)
I believe the answer is:
reeds
This clue is a double definition.
'rushes' is the first definition.
(I've seen this in another clue)
'water plants' is the second definition.
(I've seen this before)
'to get' acts as a link.
(Other definitions for reeds that I've seen before include "Tall slender grasses of wet areas" , "They vibrate to produce the sound of various musical instruments" , "Marsh plants with tall straight stems" , "Woodwind instruments" , "Stems for pens" .)