Stories about slate (5)
I believe the answer is:
tales
'stories' is the definition.
('tale' can be a synonym of 'story')
'about slate' is the wordplay.
'about' indicates anagramming the letters.
'slate' anagrammed gives 'TALES'.
(Other definitions for tales that I've seen before include "Stale kind of stories" , "Stories, perhaps tall ones" , "Stories, fables" , "They might be tall" , "accounts" .)