Mentor working in Oxford college (6)

I believe the answer is:

merton

'oxford college' is the definition.
(I've seen this before)

'mentor working' is the wordplay.
'working' is an anagram indicator.
'mentor' is an anagram of 'MERTON'.

'in' acts as a link.

(Other definitions for merton that I've seen before include "Comic" , "Oxford college: London borough" .)

I've seen this clue in The Guardian.

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