Turn to abuse storyteller (4)
I believe the answer is:
liar
'storyteller' is the definition.
(thesaurus)
'turn to abuse' is the wordplay.
'turn' is a reversal indicator.
'to abuse' becomes 'rail' (railing is a kind of abusing).
'rail' backwards is 'LIAR'.
(Other definitions for liar that I've seen before include "man of fiction?" , "Rail at a prevaricator" , "Bearer of false witness" , "27 [DECEIVER]" , "Untruthful person (Billy in Schlesinger film)" .)