Sit back following ace storyteller (5)
I believe the answer is:
aesop
'storyteller' is the definition.
(Aesop is an example)
'sit back following ace' is the wordplay.
'sit' becomes 'pose' (as in sitting for a painter).
'back' says the letters should be written in reverse.
'following' means one lot of letters go next to another.
'ace' becomes 'a' (abbreviation).
'pose' in reverse letter order is 'esop'.
'esop' put after 'a' is 'AESOP'.
(Other definitions for aesop that I've seen before include "very old writer" , "Classic fable writer" , "So ape the writer of fables" , "A pose of famed fable teller" , "Ancient Greek fabulist" .)