Shun Socrates, I fancy (9)
I believe the answer is:
ostracise
'shun' is the definition.
('shun'->'ostracize' is in my internal thesaurus and 'ize'->'ise')
'socrates i fancy' is the wordplay.
'fancy' indicates anagramming the letters.
'socrates'+'i'='socratesi'
'socratesi' anagrammed gives 'OSTRACISE'.
(Other definitions for ostracise that I've seen before include "Socrates and I are made to exclude from society" , "Exclude, blackball" , "Cast out, blackball" , "I, Socrates may exclude from group" , "Drive out" .)