The most common and most likely answer to this crossword clue is the 5 letter word ERICA
E
R
I
C
A
More clues leading to the result ERICA
- Girl in the morning leaving the US
- Anger arising about Heath, say
- Heath, one Conservative hampered by time
- Plant, one breaking some land up
- Girl in care, I suspect
- The New World overlooked by a married girl
- Am leaving the States to find her?
- Girl in Ginsberg poem a male spurned
- Heather is a girl's name
- Individual in area brought up Heather
Buddy explains!

The straight part
We know that "evergreen shrub" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case evergreen shrub = erica.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does ERICA mean?
ERICA noun- Any of many heathers, of the genus Erica, used as garden plants