Article about a new title for Macbeth (5)
I believe the answer is:
thane
'title for macbeth' is the definition.
(I've seen this in another clue)
'article about a new' is the wordplay.
'article' becomes 'the' (the definite article in English).
'about' means one lot of letters goes inside another.
'new' becomes 'n' (abbreviation as in New Testament NT).
'a'+'n'='an'
'the' going around 'an' is 'THANE'.
(Other definitions for thane that I've seen before include "Medieval lord" , "Anglo-Saxon aristocrat - old Scottish clan chief" , "baron once" , "Macbeth's Cawdor title" , "Anglo-Saxon or Scottish title" .)