Pie actor in a manner that is histrionic (8)
I believe the answer is:
operatic
'histrionic' is the definition.
(I've seen this before)
'pie actor in a manner that' is the wordplay.
'pie actor' anagrams to 'OPERATIC'.
However, I'm not clear how the anagram is indicated.
'is' is the link.
Can you help me to learn more?
(Other definitions for operatic that I've seen before include "as in G&S?" , "To do with music-drama" , "Macbeth is" , "Connected with musical drama" , "music drama" .)