Rare northern one on the green (8)
I believe the answer is:
uncommon
'rare' is the definition.
(I know that rare can be written as uncommon)
'northern one on the green' is the wordplay.
'northern one' becomes 'un' (can mean 'one' in Northern English dialects).
'on' means one lot of letters go next to another.
'the green' becomes 'common' (synonyms).
'un'+'common'='UNCOMMON'
(Other definitions for uncommon that I've seen before include "Not normal or usual" , "Extraordinary - rare" , "Not usual, remarkable" , "Exceptional" , "Rare, unusual" .)