Crossword Genius

Sort of guess a graduate might make? (8)

Ross

I believe the answer is:

educated

'sort of guess' is the definition.
(an educated guess)

I don't understand how the rest of the clue works.

(Other definitions for educated that I've seen before include "Schooled, trained" , "Instructed, taught" , "Enlightened, knowledgeable" , "Trained; learned" , "Well-read" .)

I've seen this clue in The Times.
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