Typical Bellini opera student (6)
I believe the answer is:
normal
'typical' is the definition.
(I know that typical can be written as normal)
'bellini opera student' is the wordplay.
'bellini opera' becomes 'norma' (I've seen this before).
'student' becomes 'l' (as in L-plates for learner drivers).
'norma'+'l'='NORMAL'
(Other definitions for normal that I've seen before include "Ordinary, not unusual" , "'Usual, standard (6)'" , "Standard, expected" , "Ordinary, usual" , "Conforming to what is usual" .)