Sean gets confused with older shrubs (9)
I believe the answer is:
oleanders
'shrubs' is the definition.
The definition and answer can be both plants as well as being plural nouns.
Maybe there's an association between them I don't understand?
'sean gets confused with older' is the wordplay.
'gets confused with' indicates an anagram (I've seen 'get confused' mean this (I've seen this in other clues)).
'sean' with its letters mixed up with 'older' can make 'OLEANDERS'.
Can you help me to learn more?
(Other definitions for oleanders that I've seen before include "See Arnold about these flowering shrubs" , "Evergreen shrubs" .)