Err with count badly, needing to engage a teller (9)
I believe the answer is:
raconteur
'teller' is the definition.
(term for a storyteller)
'err with count badly needing to engage a' is the wordplay.
'with' is a charade indicator (letters next to each other).
'badly' indicates anagramming the letters.
'needing to engage' indicates putting letters inside (engage can mean to capture).
'err' after 'count' is 'counterr'.
'counterr' with letters rearranged gives 'rconteur'.
'rconteur' going around 'a' is 'RACONTEUR'.
(Other definitions for raconteur that I've seen before include "A skilled story teller" , "entertaining his relations!" , "One can relate well" , "Teller of anecdotes, Frenchstyle" , "Narrator" .)