Where Richmond is unspoilt - one area (8)
I believe the answer is:
virginia
'where richmond is' is the definition.
(I've seen this before)
'unspoilt one area' is the wordplay.
'unspoilt' becomes 'virgin' (I've seen this before).
'one' becomes 'i' (Roman numeral).
'area' becomes 'a' (maths abbreviation).
'virgin'+'i'+'a'='VIRGINIA'
(Other definitions for virginia that I've seen before include "State creeper" , "US state; type of tobacco" , "Woolf and Wade" , "US state named in honour of Elizabeth I" , "Where to find Richmond" .)