### Clue: Setter's to work on parking that's not smooth (6)
### Answer: PIMPLY 
 ### Explanation: Definition: not smooth
 [ I'M("setter's";"setter is";"I am", with the setter using the self-referential pronoun) + PLY(to work regularly) ] **placed after**(on, in an across clue) P(abbrev. for "parking").