Prominently publicise cut restricting parking (6)
I believe the answer is:
splash
'prominently publicise' is the definition.
(eg publicise with a big splash in a newspaper)
'cut restricting parking' is the wordplay.
'cut' becomes 'slash' (slash is a kind of cut).
'restricting' means one lot of letters goes inside another.
'parking' becomes 'p' (abbreviation on road signs).
'slash' going around 'p' is 'SPLASH'.
(Other definitions for splash that I've seen before include "Excitement" , "Big media display -- bellyflop effect" , "Ostenatious display made by spatter of water" , "Prominent front page news story" , "Scatter liquid - prominent newspaper photo" .)