Herbal plant, European, turning red (9)
I believe the answer is:
germander
'herbal plant' is the definition.
The definition and answer can be both plants as well as being singular nouns.
Perhaps there's an association between them I don't understand?
'european turning red' is the wordplay.
'european' becomes 'german' (Germany is in Europe).
'turning' says the letters should be written in reverse.
'red' written backwards gives 'der'.
'german'+'der'='GERMANDER'
Can you help me to learn more?
(Other definitions for germander that I've seen before include "Plant of the mint family" , "Flower" , "European plant" .)