Crossword Genius

First in series of affectations upset teller of tales (5)

Ross

I believe the answer is:

aesop

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This clue could be a double definition.

'first in series of affectations upset' is the first definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

'teller of tales' is the second definition.
(I've seen this in another clue)

Can you help me to learn more?

(Other definitions for aesop that I've seen before include "Fabulous man" , "classic author" , "Greek author, famous for his fables" , "very old writer" , "Author of many fables" .)

I've seen this clue in The Times.
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