Emerge as some gentleman at Eton (7)
I believe the answer is:
emanate
'emerge' is the definition.
(thesaurus)
'some gentleman at eton' is the wordplay.
'some' indicates the answer is hidden within the clue (some of the parts of the word are used).
'EMANATE' can be found hidden inside 'gentleman at eton'.
'as' acts as a link.
(Other definitions for emanate that I've seen before include "Emerge or originate" , "Rise" , "Proceed or issue forth" , "Issue forth, from a source" , "Give out, emit" .)