Ivan turned out conceited (4)
I believe the answer is:
vain
'conceited' is the definition.
('vain' can be a synonym of 'conceited')
'ivan turned out' is the wordplay.
'turned out' is an anagram indicator.
'ivan' is an anagram of 'VAIN'.
(Other definitions for vain that I've seen before include "Egotistical" , "Having too much pride in one's appearance" , "is full of himself" , "Conceited or unavailing" , "Conceited, arrogant" .)