Abjure wickedness, as casual visitor does (5,2)
I believe the answer is:
drops in
'as casual visitor does' is the definition.
(to drop in to someone is to make a casual visit)
'abjure wickedness' is the wordplay.
'abjure' becomes 'drop' (to abjure is to give up or renounce).
'wickedness' becomes 'sin' (synonyms).
'drop'+'sin'='DROPS IN'
(Other definitions for drops in that I've seen before include "Casually visits" , "Calls casually" , "Comes to see" , "eye thus getting less inflamed?" .)