Crossword Genius

Least frequent (6)

Ross

I believe the answer is:

(Other definitions for rarest that I've seen before include "Most scarce or least common" , "Most scarce or infrequent" , "most excellent" , "Sartre (anag) -- most uncommon" , "Most scarce and probably precious" .)

I've seen this clue in The Times and The Mirror.
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