Crossword Genius

Excellent red at dinner (4)

Ross

I believe the answer is:

rare

I'm a little stuck... Click here to teach me more about this clue!

'excellent' is the definition.
(I've seen this in another clue)

'red at dinner' is the wordplay.
'red' becomes 'r' (I've seen this in other clues).
'at dinner' becomes 'are' (I can't explain this - if you can you should believe this answer much more).
'r'+'are'='RARE'

Can you help me to learn more?

(Other definitions for rare that I've seen before include "Not common" , "Occurring infrequently" , "Scarcely seen" , "Seldom encountered" , "(Of meat) red" .)

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