Short moral stories (6)
I believe the answer is:
fables
'short moral stories' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for fables that I've seen before include "Tales from Aesop" , "Stories as told by Aesop" , "Legends or parables as told by Aesop" , "Short moral stories, as those by Aesop" , "Myths and legends" .)