Attempt to pocket object that's fashionable (6)
I believe the answer is:
trendy
'fashionable' is the definition.
(similar in meaning)
'attempt to pocket object' is the wordplay.
'attempt to' becomes 'try' (I've seen this in other clues).
'pocket' is an insertion indicator.
'object' becomes 'end' (both can mean a goal or purpose).
'try' going around 'end' is 'TRENDY'.
'that's' acts as a link.
(Other definitions for trendy that I've seen before include "Informally, following the fashions" , "all the rage" , "Modish" , "Informally in the latest fashion" , "In fashion, of popular style" .)