Fashion displayed by feisty lecturer (5)
I believe the answer is:
style
'fashion' is the definition.
(I know that fashion is a class)
'displayed by feisty lecturer' is the wordplay.
'displayed by' indicates the answer is hidden within the clue.
'STYLE' is hidden within 'feisty lecturer'.
(Other definitions for style that I've seen before include "Chic" , "Method; elegance" , "Distinctive arrangement, elegance" , "Fashion, manner, mode" , "Manner; elegance" .)