Crossword Genius

Quietly set up goody-goody (4)

Ross

I believe the answer is:

prig

'goody-goody' is the definition.
(thesaurus)

'quietly set up' is the wordplay.
'quietly' becomes 'p' (p for piano and quiet).
'set up' becomes 'rig' ('rig' can be a synonym of 'set up').
'p'+'rig'='PRIG'

(Other definitions for prig that I've seen before include "humbug" , "Puritanical or arrogant and annoying person" , "Unpleasant arrogant person" , "Self-righteous moralist" , "Self-righteous hypocrite" .)

I've seen this clue in The Guardian.
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