Crossword Genius

Of which there is only one (6)

Ross

I believe the answer is:

unique

'of which there is only one' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for unique that I've seen before include "Singular, one of a kind" , "One-off" , "incomparable" , "Singular, different from others" , "Single" .)

I've seen this clue in the Irish Times (Simplex) and the Sydney Morning Herald.
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