Physician to ignore court opening (4)
I believe the answer is:
door
'opening' is the definition.
(thesaurus)
'physician to ignore court' is the wordplay.
'physician' becomes 'doctor' ('doctor' can be a synonym of 'physician').
'to ignore' is a deletion indicator.
'court' becomes 'ct'.
'doctor' with 'ct' taken out is 'DOOR'.
(Other definitions for door that I've seen before include "Portal" , "Entrance to room, house etc" , "Entry point" , "Hinged barrier" , "Moveable structure at an entrance" .)