... outlaw tried in special court (9)
I believe the answer is:
interdict
'outlaw' is the definition.
(I know that outlaw is a more specific form of the action interdict)
'tried in special court' is the wordplay.
'special' is an anagram indicator.
'court' becomes 'ct' (abbreviation used in road names).
'tried'+'in'='triedin'
'triedin' with letters rearranged gives 'interdi'.
'interdi'+'ct'='INTERDICT'
(Other definitions for interdict that I've seen before include "Decree" , "An authoritative prohibition, maybe by church" , "Prohibit - tin credit (anag)" , "Ban" , "Credit tin (anag) - ecclesiastical sanction" .)