Crossword Genius

Here speaks a writer for a change (11)

Ross

I believe the answer is:

shakespeare

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'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" .)

I've seen this clue in The Irish News.
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