English detective gets court order (5)
I believe the answer is:
edict
'order' is the definition.
('edict' can be a synonym of 'order')
'english detective gets court' is the wordplay.
'english' becomes 'e' (abbreviation).
'detective' becomes 'di' (Detective Inspector abbreviation).
'gets' is a charade indicator (letters next to each other).
'court' becomes 'ct'.
'e'+'di'+'ct'='EDICT'
(Other definitions for edict that I've seen before include "Cited an official proclamation" , "Legally binding proclamation" , "Formal proclamation" , "Declaration" , "Official decree" .)