Question for criminal trial (7)
I believe the answer is:
contest
'question' is the definition.
(thesaurus)
'criminal trial' is the wordplay.
'criminal' becomes 'con' (abbreviation for 'convict').
'trial' becomes 'test' ('test' can be a synonym of 'trial').
'con'+'test'='CONTEST'
'for' acts as a link.
(Other definitions for contest that I've seen before include "Competition; dispute" , "Match" , "Competition or conflict" , "Oppose - competition" , "Tournament" .)