Finished postgrad degree with new supervisor (7)

I believe the answer is:

overman

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'supervisor' is the definition.
(thesaurus)

'finished postgrad degree with new' is the wordplay.
'finished' becomes 'over' (over can mean finished or ended).
'postgrad degree' becomes 'ma' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'with' means one lot of letters go next to another.
'new' becomes 'n' (abbreviation as in New Testament NT).
'over'+'ma'+'n'='OVERMAN'

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(Other definitions for overman that I've seen before include "Provide too many staff for" , "Provide with too many crew" , "crew too much" .)

I've seen this clue in The Times.

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