Fabulous old author? (5)

I believe the answer is:

aesop

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'old author?' is the definition.
(I know that Aesop is old)

I can't explain the remainder of the clue.

(Other definitions for aesop that I've seen before include "Greek author, famous for his fables" , "his writings were fabulous" , "So ape the writer of fables" , "Fabulous man" , "Ancient Greek fabulist" .)

I've seen this clue in The Guardian.

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