The most common and most likely answer to this crossword clue is the 5 letter word AESOP
I've seen this crossword clue in The Daily Telegraph
A
E
S
O
P
More clues leading to the result AESOP
- Model put up by a fabulous writer
- Old storyteller regularly made use of PA
- A page of baseless, false old stories
- Storyteller sending up main work
- Fabulist initially adopted backward attitude
- Story-teller recalled river meeting larger body of water
- Fabulous writer thus breaking a record
- Greek author writing a page about European leader thus
- Fabulous writer circulating main work
- Model backed by a fabulous writer
Buddy explains!
The straight part
We know that "he was fabulously creative" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case he was fabulously creative = aesop.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.