"Macbeth" quintet (4)
I believe the answer is:
acts
'macbeth quintet' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for acts that I've seen before include "Deeds or play segments" , "Fifth book of the New Testament" , "Cast in major divisions of plays, like Shakespeare's" , "individual performers in a show" , "Pieces of legislation" .)