Island to the west of my new house (9)
I believe the answer is:
capricorn
'house' is the definition.
(Capricorn is an example)
'island to the west of my new' is the wordplay.
'island' becomes 'capri' (Italian island).
'to the west of' says to put letters next to each other (some letters go to the west or 'left').
'my' becomes 'cor' (both are expressions of surprise).
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'capri'+'cor'+'n'='CAPRICORN'
(Other definitions for capricorn that I've seen before include "It's a Tropic, and the Sign of the Goat" , "Sign of winter" , "Goat star sign" , "Tropic - Zodiac sign" , "Constellation known as The Goat" .)