Recalled concern about a scented plant (6)
I believe the answer is:
yarrow
'scented plant' is the definition.
'yarrow' can be an answer for 'plant' (yarrow is a kind of plant). I am not certain of the 'scented' bit.
'recalled concern about a' is the wordplay.
'recalled' says the letters should be written backwards (to recall can mean to bring something back).
'concern' becomes 'worry' (synonyms).
'about' is an insertion indicator.
'worry' placed around 'a' is 'worray'.
'worray' back-to-front is 'YARROW'.
Can you help me to learn more?
(Other definitions for yarrow that I've seen before include "Wild aromatic plant" , "Sneezewort" , "Strong-scented creeping plant, once used in herbal medicine" , "Pungent plant" , "Achillea, milfoil" .)