Old bishop visiting unfamiliar alien part of France (8)
I believe the answer is:
lorraine
'part of france' is the definition.
('Lorraine' is part of 'france')
'old bishop visiting unfamiliar alien' is the wordplay.
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'bishop' becomes 'rr' (abbreviation for Right Reverend).
'visiting' is an insertion indicator.
'unfamiliar' indicates anagramming the letters.
'o'+'rr'='orr'
'alien' is an anagram of 'laine'.
'orr' inserted into 'laine' is 'LORRAINE'.
(Other definitions for lorraine that I've seen before include "part of France" , "Region of NE France" , "Region of eastern France, and famous Cross" , "Girl's name - Nancy's region" , "French region, cross" .)