Abuse met at minster, unfortunately (12)
I believe the answer is:
mistreatment
'abuse' is the definition.
(I've seen this before)
'met at minster unfortunately' is the wordplay.
'unfortunately' indicates an anagram (a bad or unfortunate spelling).
'met'+'at'+'minster'='metatminster'
'metatminster' is an anagram of 'MISTREATMENT'.
(Other definitions for mistreatment that I've seen before include "overrevving?" , "Abuse; bad handling" , "Cruel misuse" .)