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' (abbreviation for Church of England).
'after' means one lot of letters go next to another.
'turning' is an anagram indicator.
'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" .)