Butte neighbor (6)
I believe the answer is:
helena
'butte neighbor' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for helena that I've seen before include "Saint who was a Roman empress" , "Island saint in the South Atlantic" , "Girl's name - US state capital" , "Female in A Midsummer Night's Dream" , "Could be Rubinstein" .)