Vandalise church after turning deaf (6)
I believe the answer is:
deface
'vandalise' is the definition.
(I know that deface is a more specific form of the action the vandalise)
'church after turning deaf' is the wordplay.
'church' becomes 'ce' (Church of England).
'after' is a charade indicator (letters next to each other).
'turning' indicates anagramming the letters.
'deaf' anagrammed gives 'defa'.
'ce' put after 'defa' is 'DEFACE'.
(Other definitions for deface that I've seen before include "Disfigure, spoil the surface of" , "six notes?" , "Mar or spoil the appearance of" , "ruin" , "Spoil or damage the surface of" .)