Concerning start of machinations against property? (5)

I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

IN RE (Latin-derived legal term meaning “in the matter of” = concerning = on the subject of) + starting letter of M [achinations]. Another Latin-derived legal term, meaning an action or judgement that is directed towards property or an object rather than towards a person. I can’t help feeling that this is a weak clue because in re and in rem have basically the same derivation: from in (in or on) + res (a thing).