Banal sort of operatic style (13)
I believe the answer is:
stereotypical
'banal' is the definition.
Both the definition and answer are adjectives. Maybe they are linked in a way I don't understand?
'sort of operatic style' is the wordplay.
'sort of' indicates anagramming the letters.
'operatic'+'style'='operaticstyle'
'operaticstyle' is an anagram of 'STEREOTYPICAL'.
Can you help me to learn more?
(Other definitions for stereotypical that I've seen before include "true to expected form" , "in keeping with stock character" .)