Get the better of berk at Balliol? (6)
I believe the answer is:
outwit
'get the better of' is the definition.
(thesaurus)
I cannot understand how the remainder of the clue works.
(Other definitions for outwit that I've seen before include "Outsmart" , "Intellectually get the better of" , "Dupe" , "Get the better of by cunning" , "Defeat by superior ingenuity" .)