Wrong men seen in empty tenement (4)
I believe the answer is:
tort
'wrong' is the definition.
(legal term)
'men seen in empty tenement' is the wordplay.
'men' becomes 'or' (I've seen this in other clues).
'seen in' is an insertion indicator.
'empty' means to remove the middle letters.
'tenement' with its middle taken out is 'tt'.
'or' put inside 'tt' is 'TORT'.
(Other definitions for tort that I've seen before include "Wrongdoing for which damages may be sought" , "Civil wrong or injury" , "Trot to get legal wrong" , "Private or civil wrong open to damages" , "Small tropical fish" .)