School in Princeton? (4)

I believe the answer is:

eton

I'm a little stuck... Click here to teach me more about this clue!

'school' is the definition.
(famous UK public school)

'princeton?' is the wordplay.
'ETON' is hidden in amongst the letters.
But, I am not sure how this is indicated.

'in' acts as a link.

Can you help me to learn more?

(Other definitions for eton that I've seen before include "Famous English public school" , "Kind of collar or jacket (worn at college?)" , "Public school founded by Henry VI" , "School - note (anag)" , "Independent school" .)

I've seen this clue in the Evening Standard.

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