Creep gets advice from traffic police
I believe the answer is:
go slow
'creep' is the definition.
(thesaurus)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for go slow that I've seen before include "Grandfather if neglected may" , "Lazy sort of industrial action?" , "A deliberately retarded pace as in industrial action" , "Work-delaying action" , "lagging" .)