A pose as a fabulist (5)
I believe the answer is:
aesop
'a fabulist' is the definition.
(Greek composer of fables)
'a pose' is the wordplay.
'a pose' anagrams to 'AESOP'.
Though, I am not clear how this is indicated.
'as' is the link.
Can you help me to learn more?
(Other definitions for aesop that I've seen before include "satirical writer" , "fabulous figure?" , "A classical fable teller" , "Ancient Greek author of moral tales" , "very old writer" .)