Macbeth's title (5)
I believe the answer is:
thane
'macbeth's title' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for thane that I've seen before include "baron once" , "Anglo-Saxon king's companion; neath (anag.)" , "Anglo-Saxon noble of lower rank" , "Old lord" , "Anglo-Saxon or Scottish title" .)