Good variety of rose or evergreen shrub (5)
I believe the answer is:
gorse
'evergreen shrub' is the definition.
'gorse' can be an answer for 'shrub' (gorse is a kind of shrub). I am not certain of the 'evergreen' bit.
'good variety of rose' is the wordplay.
'good' becomes 'g' (abbreviation**).
'variety of' indicates an anagram.
'rose' with letters rearranged gives 'orse'.
'g'+'orse'='GORSE'
'or' acts as a link.
Can you help me to learn more?
(Other definitions for gorse that I've seen before include "Prickly moorland plant" , "Prickly heath shrub" , "Prickly shrub, furze, whin" , "Spiny evergreen shrub" , "Prickly shrub with yellow flowers" .)