Cruel treatment in Villa bus examined (5)
I believe the answer is:
abuse
'cruel treatment' is the definition.
(I've seen this before)
'in villa bus examined' is the wordplay.
'in' says the answer is hidden in the clue.
'ABUSE' is hidden in the letters of 'villa bus examined'.
(Other definitions for abuse that I've seen before include "Party official; dessert" , "Cruel treatment" , "Maltreat" , "Inveigh against" , "Deceit" .)