Crossword Genius

Important discovery (12)

Ross

I believe the answer is:

breakthrough

'important discovery' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for breakthrough that I've seen before include "Find" , "(At last!) the solution, eg to scientific problem" , "Success" , "Important discovery" , "Significant discovery - ending of impasse" .)

I've seen this clue in The Guardian.
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