Crossword Genius

Significant advance (12)


I believe the answer is:


'significant advance' is the definition.
(I've seen this before)

This is all the clue.

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

I've seen this clue in The Guardian.
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