One with no heart playing Macbeth for example (8)
I believe the answer is:
antihero
'macbeth for example' is the definition.
'one with no heart playing' is the wordplay.
'one' becomes 'i' (Roman numeral).
'with' is a charade indicator (letters next to each other).
'playing' indicates anagramming the letters.
'no'+'heart'='noheart'
'i' after 'noheart' is 'nohearti'.
'nohearti' anagrammed gives 'ANTIHERO'.
(Other definitions for antihero that I've seen before include "baddie" , "Character such as Meursault" , "Winston Smith in Orwell's 1984, for example" , "central character, say" , "principal character lacking noble qualities" .)