Storyteller sending up main work (5)
I believe the answer is:
aesop
'storyteller' is the definition.
(Aesop is an example)
'sending up main work' is the wordplay.
'sending up' says the letters should be written in reverse.
'main' becomes 'sea' ('sea' can be a synonym of 'main').
'work' becomes 'op' (abbreviation for opus).
'sea' written backwards gives 'aes'.
'aes'+'op'='AESOP'
(Other definitions for aesop that I've seen before include "he wrote in Greek" , "Greek fable writer" , "Author of many fables" , "A pose by Greek writer of fables" , "Classic fable writer" .)