Charge for a plant (4)
I believe the answer is:
rush
This clue is a double definition.
'charge' is the first definition.
(I know that charge can be written as Rush)
'plant' is the second definition.
(rush is a type of plant)
'for a' is the link.
(Other definitions for rush that I've seen before include "Speed along - waterside plant" , "Deal with (something) hurriedly" , "'Hurry, haste (4)'" , "Burn rubber" , "Charge" .)