Regulation of manoeuvring done in car (9)
I believe the answer is:
ordinance
'regulation' is the definition.
('ordinance' can be a synonym of 'regulation')
'manoeuvring done in car' is the wordplay.
'manoeuvring' indicates anagramming the letters.
'done'+'in'+'car'='doneincar'
'doneincar' anagrammed gives 'ORDINANCE'.
'of' is the link.
(Other definitions for ordinance that I've seen before include "Canon" , "Edict, order" , "Authoritative decree" , "Regulation" , "religious service maybe" .)