An Oxbridge tutor is handsome fellow (6)

I believe the answer is:

adonis

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'handsome fellow' is the definition.
(I've seen this before)

'an oxbridge tutor is' is the wordplay.
'an' becomes 'a'.
'oxbridge tutor' becomes 'don' (I can't justify this - if you can you should give a lot more credence to this answer).
'a'+'don'+'is'='ADONIS'

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(Other definitions for adonis that I've seen before include "Archetype of male beauty" , "Beautiful Greek youth" , "ideal man" , "Handsome youth - boy from Greek mythology" , "handsome lad" .)

I've seen this clue in The Sun.

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