Confused type sounding sanctimonious (3)
I believe the answer is:
pie
'confused type' is the definition.
(I've seen this before)
'sounding sanctimonious' is the wordplay.
'sounding' indicates a 'sounds like' (homophone) clue.
'sanctimonious' becomes 'pi' (old-fashioned term for pious).
'pi' is a homophone of 'PIE'.
(Other definitions for pie that I've seen before include "Pastry crust with filling" , "In the sky, this dish is impractical" , "Slapstick missile" , "Small, former Indian coin" , "where blackbirds sang" .)