Evergreen plant (3)
I believe the answer is:
ivy
'evergreen plant' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for ivy that I've seen before include "Clinging evergreen" , "Climbing plant, associated with holly" , "Evergreen creeping plant" , "Poisonous plant" , "Climbing shrub; f. name" .)