Crossword Genius

Previously unknown (7-2)

Ross

I believe the answer is:

unheard-of

'previously unknown' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for unheard-of that I've seen before include "Previously unknown" , "Without precedent" , "Not previously known or done - inaudible?" , "Unknown - novel" , "Fear hound being not previously known" .)

I've seen this clue in The Guardian, The Times and the Wall Street Journal.
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