Year-end greenery (5)
I believe the answer is:
holly
'year-end greenery' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for holly that I've seen before include "Tree with red berries" , "Prickly-leaved shrub" , "Ilex -- popular at Christmas" , "Evergreen shrub" , "Evergreen tree with spiky leaves" .)