Last three
2d Something reddish brown, very red poison 6 C _ R _ R _
6d Find flesh by the ear 4 M _ E _
20d Couple with a jacket on, I gathered 6 _ D _ O _ E
I think I have it...CU=copper which is reddish brown, then Rare= very red as in steak (thanks, baibee, didn't see that at all.)
And Curare is indeed a poison.