Novice storyteller is holding back (4)
I believe the answer is:
tyro
'novice' is the definition.
(term for a beginner)
'storyteller is holding back' is the wordplay.
'is holding' indicates the answer is hidden within the clue.
'back' says the letters should be written backwards.
'oryt' is hidden in the letters of 'storyteller'.
'oryt' in reverse letter order is 'TYRO'.
(Other definitions for tyro that I've seen before include "Neophyte" , "New" , "'Beginner, novice (4)'" , "Spell for rookie" , "Initiate" .)