Crossword Genius

Excellent damson (4)

Ross

I believe the answer is:

plum

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'damson' is the definition.
(thesaurus)

I cannot understand how the remainder of the clue works.

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(Other definitions for plum that I've seen before include "Dark reddish-purple colour: especially valued" , "Brilliant" , "Fruit tree - of especial value?" , "First-class - fruit" , "Very desirable thing" .)

I've seen this clue in The Mirror.
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