Crossword Genius

One qualification is not quite enough for the statesman (7)

Ross

I believe the answer is:

diploma

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'one qualification' is the definition.
(type of academic qualification)

I can't explain the remainder of the clue.

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(Other definitions for diploma that I've seen before include "Exam certificate" , "Certificate awarded by college for educational attainment" , "Academic award" , "Certificate of competency" , "Academic certificate" .)

I've seen this clue in The Irish News.
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