Teller managed closure of East European banking company (9)
I believe the answer is:
raconteur
'teller' is the definition.
(term for a storyteller)
'managed closure of east european banking company' is the wordplay.
'managed' becomes 'ran' (I've seen this before).
'closure of' indicates one should take the final letters.
'european' becomes 'eur' (common abbreviation).
'banking' indicates putting letters inside.
'company' becomes 'co' (abbreviation).
The last letter of 'east' is 't'.
'ran'+'t'+'eur'='ranteur'
'ranteur' placed around 'co' is 'RACONTEUR'.
(Other definitions for raconteur that I've seen before include "A skilled storyteller, very entertaining" , "Skilful teller of tales" , "Narrator" , "entertaining his relations!" , "One can relate well" .)