Up-to-date info from US city trial (6)
I believe the answer is:
latest
'up-to-date info' is the definition.
(the latest information)
'us city trial' is the wordplay.
'us city' becomes 'LA' (short for Los Angeles).
'trial' becomes 'test' (synonyms).
'la'+'test'='LATEST'
'from' acts as a link.
(Other definitions for latest that I've seen before include "style of today" , "Most recent report" , "State-of-the-art" , "Most recent or tardiest" , "Most up-to-date" .)