Noble not turning up for university (9)

I believe the answer is:

princeton

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'for university' is the definition.
(Princeton is an example)

'noble not turning up' is the wordplay.
'noble' becomes 'prince' (I can't explain this - if you can you should believe this answer much more).
'turning up' says the letters should be written backwards.
'not' reversed gives 'ton'.
'prince'+'ton'='PRINCETON'

Can you help me to learn more?

(Other definitions for princeton that I've seen before include "US ivy league university" , "American university" , "College" , "Member of the 11 in New Jersey" , "Early US university" .)

I've seen this clue in The Guardian.

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