Christian attending first university (5)
I believe the answer is:
uniat
'christian' is the definition.
(Uniat is an example)
'attending first university' is the wordplay.
'attending' becomes 'at' (I've seen this in other clues).
'first' is a charade indicator (letters next to each other).
'university' becomes 'uni' (I've seen this in other clues).
'at' after 'uni' is 'UNIAT'.
(Other definitions for uniat that I've seen before include "member of church" , "member of a Christian community" , "Eastern Christian; anti U (anag.)" , "Type of Christian" .)