Parking Mister Silly consents to (7)
I believe the answer is:
permits
'consents to' is the definition.
(I've seen this before)
'parking mister silly' is the wordplay.
'parking' becomes 'p' (abbreviation on road signs).
'silly' indicates anagramming the letters.
'mister' is an anagram of 'ermits'.
'p'+'ermits'='PERMITS'
(Other definitions for permits that I've seen before include "Consents to" , "Allows" .)