Crossword Genius

Fully determine (9)

Ross

I believe the answer is:

ascertain

'fully determine' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for ascertain that I've seen before include "Establish after an investigation or study" , "Find out - make sure" , "Get to know" , "Establish (the facts)" , "Discover" .)

I've seen this clue in the Newsday.
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