The latest goal in test (6)
I believe the answer is:
trendy
'the latest' is the definition.
(as in the latest trend)
'goal in test' is the wordplay.
'goal' becomes 'end' (synonyms).
'in' means one lot of letters goes inside another.
'test' becomes 'try' (synonyms).
'end' placed inside 'try' is 'TRENDY'.
(Other definitions for trendy that I've seen before include "Smart" , "Stylish" , "Up to date, fashionable" , "With it, a la mode" , "Modish" .)