One new northern hotel (3)
I believe the answer is:
inn
'hotel' is the definition.
(inn is a kind of hotel)
'one new northern' is the wordplay.
'one' becomes 'i' (Roman numeral).
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'northern' becomes 'n' (abbreviation e.g. N. Ireland).
'i'+'n'+'n'='INN'
(Other definitions for inn that I've seen before include "place to stay" , "Hotel with lodging for travellers" , "English country pub" , "Hostelry, tavern" , "Drinking-place" .)