### Clue: Quietly set up goody-goody (4)
### Answer: PRIG 
 ### Explanation: Definition: goody-goody
 P(abbrev. for "piano"/a musical direction to play quietly/softly) + RIG(to set up/to put together a device, equipment, or structure, as in "to rig a booby trap").
Defn: A … who is unbearably self-righteous and conceited.