Characters in Macbeth? Nice and traditional (6)
I believe the answer is:
'traditional' is the definition.
(eg ethnic dress)
'characters in macbeth? nice and' is the wordplay.
'characters in' indicates the answer is hidden within the clue.
'ETHNIC' can be found hidden inside 'macbeth nice and'.
(Other definitions for ethnic that I've seen before include "Of groups of people with common customs" , "Denoting the cultural traditions of a group" , "Exotic" , "Relating to a particular culture" , "Denoting origin by descent" .)