Crossword Genius

Like the blood type AB negative (4)

Ross

I believe the answer is:

rare

(Other definitions for rare that I've seen before include "Not well done!" , "thin on the ground" , "Still red inside (as hens' teeth?)" , "Ben Jonson was considered so" , "Rear up, being scarce" .)

I've seen this clue in The Washington Post.
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