Become apparent in some of Vasari's eccentricities (5)
I believe the answer is:
arise
'become apparent' is the definition.
(I've seen this before)
'some of vasari's eccentricities' is the wordplay.
'some of' says the answer is hidden in the clue.
'ARISE' is hidden within 'vasaris eccentricities'.
'in' is the link.
(Other definitions for arise that I've seen before include "Occur; stand up" , "Emerge" , "Spring - get up" , "Ascend" , "Originate; get up" .)