Retiring Bengali vicar's well-mannered (5)
I believe the answer is:
civil
'well-mannered' is the definition.
(I've seen this in another clue)
'retiring bengali vicar's' is the wordplay.
'CIVIL' is hidden back-to-front within the letters.
However, I'm not sure how the hidden word is indicated.
(Other definitions for civil that I've seen before include "Relating to citizens" , "Courteous, polite" , "(Of law) non-criminal" , "Courteously polite" , "Nonviolent refusal to obey laws" .)