Fraternal order since 1868 (4)
I believe the answer is:
elks
'fraternal order since 1868' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for elks that I've seen before include "Moose(s)" , "Moose" , "Large deer of Europe and N America" , "Large deer of Northern Europe" , "Large deer with flattened antlers" .)