Rancher's mark (5)
I believe the answer is:
brand
'rancher's mark' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for brand that I've seen before include "Type of product; sword" , "Ibsen play; trade name" , "Label" , "Class of products - stigma" , "Type of product, mark cattle" .)