Here speaks a writer for a change (11)
I believe the answer is:
shakespeare
'a change' is the definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.
'here speaks a writer' is the wordplay.
'here speaks a' can be anagrammed to 'SHAKESPEARE'.
But, I am unsure how the anagram is indicated.
'for' acts as a link.
Can you help me to learn more?
(Other definitions for shakespeare that I've seen before include "As writer he is performed" , "Author of Hamlet" , "No 1 poet" , "English playwright" , "English poet" .)