New gold key for the house (5)
I believe the answer is:
lodge
'house' is the definition.
(I know that lodge is a type of house)
'new gold key' is the wordplay.
'new' is an anagram indicator.
'key' becomes 'e' (musical key).
'gold' anagrammed gives 'lodg'.
'lodg'+'e'='LODGE'
'for the' is the link.
(Other definitions for lodge that I've seen before include "abode" , "A beaver's or otter's lair (5)" , "House in the wilds" , "Chalet" , "Small dwelling, part of estate" .)