The aim in an attempt to be fashionable (6)
I believe the answer is:
trendy
'be fashionable' is the definition.
('trendy' can be similar in meaning to 'fashionable')
'the aim in an attempt' is the wordplay.
'the aim' becomes 'end' (I've seen this before).
'in' means one lot of letters goes inside another.
'an attempt' becomes 'try' ('try' can be a synonym of 'attempt').
'end' put within 'try' is 'TRENDY'.
'to' acts as a link.
(Other definitions for trendy that I've seen before include "following latest convention" , "Up to date, fashionable" , "Voguish" , "Stylish" , "With-it" .)