Leaders in fashion or pretentious show-offs? (4)
I believe the answer is:
fops
'leaders in fashion or pretentious show-offs?' is the definition.
I can't judge whether this definition defines the answer.
'leaders in fashion or pretentious show' is the wordplay.
'leaders in' suggests taking the first letters.
The first letters of 'fashion or pretentious show' is 'FOPS'.
(Other definitions for fops that I've seen before include "Dandies, overdressed men" , "People concerned with appearance" , "People affected" .)