Crossword Genius

Of which there is only one (6)

Ross

I believe the answer is:

unique

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">of which there is only one</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>

(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 Sydney Morning Herald and the Irish Times (Simplex).
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