Fashionable attitude, for example (8)
I believe the answer is:
instance
'example' is the definition.
('instance' can be a synonym of 'example')
'fashionable attitude' is the wordplay.
'fashionable' becomes 'in' ('in' can be similar in meaning to 'fashionable').
'attitude' becomes 'stance' (stance is a kind of attitude).
'in'+'stance'='INSTANCE'
'for' acts as a link.
(Other definitions for instance that I've seen before include "Cite as an example" , "'Example, illustration (8)'" , "Case - isn't acne (anag)" , "Specimen" , "Case in point" .)