One qualification is not quite enough for the statesman (7)
I believe the answer is:
diploma
'one qualification' is the definition.
(type of academic qualification)
I can't explain the remainder of the clue.
Can you help me to learn more?
(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" .)