As good as Aesop's works? (8)

I believe the answer is:

fabulous

I'm a little stuck... Click here to teach me more about this clue!

'as good' is the definition.
'fabulous' can be an answer for 'good' (thesaurus). I'm not certain of the 'as' bit.

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for fabulous that I've seen before include "Marvellous, incredibly great" , "Legendary or, today, quite marvellous" , "Legendary or wonderful" , "Ace" , "Legendary or informally marvellous" .)

I've seen this clue in The Sun.

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