Breaking news from city trial (6)
I believe the answer is:
latest
'breaking news' is the definition.
(I've seen this in another clue)
'city trial' is the wordplay.
'city' becomes 'LA' (Los Angeles).
'trial' becomes 'test' (synonyms).
'la'+'test'='LATEST'
'from' acts as a link.
(Other definitions for latest that I've seen before include "coming after all the others" , "Most recent, hot off the press" , "Most recent or most unpunctual" , "Most recent report" , "Most recent (news)" .)