Macbeth maybe with a new part (5)
I believe the answer is:
thane
'macbeth' is the definition.
(Shakespeare's Macbeth was Thane of Glamis)
'with a new part' is the wordplay.
'part' indicates a hidden word.
'THANE' is hidden within 'with a new'.
'maybe' acts as a link.
(Other definitions for thane that I've seen before include "Anglo-Saxon noble of lower rank" , "Title held by Macbeth" , "Medieval Scottish clan chief" , "Anglo-Saxon aristocrat - old Scottish clan chief" , "baron once" .)