Fret over keeping a Eurasian plant (6)
I believe the answer is:
yarrow
'plant' is the definition.
(yarrow is a kind of plant)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for yarrow that I've seen before include "bloomer" , "Aromatic wild flower" , "Wild aromatic plant" , "Strong-scented creeping plant, once used in herbal medicine" , "Sneezewort" .)