Dated feature of Norman castle's central court (3,6)
I believe the answer is:
old bailey
'central court' is the definition.
(Central Criminal Court of England and Wales)
'dated feature of norman castle's' is the wordplay.
'dated' becomes 'old' (dated means old-fashioned).
'feature of norman castle' becomes 'bailey' (wall around a castle).
'old'+'bailey'='OLD BAILEY'
(Other definitions for old bailey that I've seen before include "London's Central Criminal Court" , "Central Criminal Court in London" , "suitable for trial in London" , "Courts" .)