Make an effort, securing objective with it (6)
I believe the answer is:
trendy
'with it' is the definition.
(thesaurus)
'make an effort securing objective' is the wordplay.
'make an effort' becomes 'try' (I've seen this before).
'securing' indicates putting letters inside.
'objective' becomes 'end' (I've seen this before).
'try' placed around 'end' is 'TRENDY'.
(Other definitions for trendy that I've seen before include "Less sensible; a dye plant" , "With it, a la mode" , "Smart" , "With-it" , "'Hip, fashionable (6)'" .)