House with a new gold key (5)
I believe the answer is:
lodge
'house' is the definition.
(lodging is a kind of housing)
'with a new gold key' is the wordplay.
'with' says to put letters next to each other.
'a new' is an anagram indicator.
'key' becomes 'e' (I've seen this in other clues).
'gold' is an anagram of 'lodg'.
'lodg' next to 'e' is 'LODGE'.
(Other definitions for lodge that I've seen before include "residence" , "next door to Mansion House?" , "British physicist" , "Beaver's home - hunters use it!" , "Lair of beaver or otter" .)