Effort encompassing goal in fashion (6)
I believe the answer is:
trendy
'in fashion' is the definition.
(thesaurus)
'effort encompassing goal' is the wordplay.
'effort' becomes 'try' ('try' can be a synonym of 'effort'**).
'encompassing' means one lot of letters goes inside another.
'goal' becomes 'end' ('end' can be a synonym of 'goal').
'try' going around 'end' is 'TRENDY'.
(Other definitions for trendy that I've seen before include "Hot" , "Informally fashionable" , "following latest convention" , "Fashionable, in style" , "Informally, following the fashions" .)