Crossword Genius

Mountaineer is student interrupting term at Oxford (7)

Ross

I believe the answer is:

hillary

'mountaineer' is the definition.
(mountaineer Edmund Hillary)

'student interrupting term at oxford' is the wordplay.
'student' becomes 'L' (learner, as in L-plates for learner drivers).
'interrupting' is an insertion indicator.
'term at oxford' becomes 'hilary' (an academic term at the University of Oxford).
'l' placed inside 'hilary' is 'HILLARY'.

'is' acts as a link.

(Another definition for hillary that I've seen is " Legendary climber".)

I've seen this clue in The Telegraph.
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