Device in Palace redesigned to restrict parking (9)
I believe the answer is:
appliance
'device' is the definition.
(I know that appliance is a type of device)
'in palace redesigned to restrict parking' is the wordplay.
'redesigned' indicates an anagram.
'to restrict' means one lot of letters goes inside another (restrict can mean pen in or contain).
'parking' becomes 'p' (abbreviation on road signs).
'in'+'palace'='inpalace'
'inpalace' is an anagram of 'apliance'.
'apliance' going around 'p' is 'APPLIANCE'.
(Other definitions for appliance that I've seen before include "Tool or device for a specific task" , "Domestic machine" , "Device used for a particular purpose" , "Machine (for use in the home)" , "Device performing specific task" .)