Excellent fruit (4)
I believe this clue is a double definition.
'excellent' is the first definition.
(star can mean excellent or top-quality)
'fruit' is the second definition.
(star fruit is a kind of fruit)
(Other definitions for star that I've seen before include "Ball of fire" , "Famous person" , "Heavenly body - leading actress?" , "appear above others?" , "Lead actor" .)
'fruit' is the definition.
(I know that plum is a type of fruit)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for plum that I've seen before include "Edible oval fruit" , "Dark-red fruit" , "Prize" , "Brilliant" , "Fruit; something choice" .)