The most common and most likely answer to this crossword clue is the 7 letter word HANOVER
I've seen this crossword clue in Financial Times
H
A
N
O
V
E
R
More clues leading to the result HANOVER
- European city exchange disregarding Germany?
- A bit of help: one across is a house
- Following ousting of duke, relinquish claim to dynasty
- Abandoning Germany, transfer house
- Chinese race finished in George’s house?
- Woman’s receiving AM in house
- British dynasty and Chinese dynasty finished
- Evidence of overindulgence not good for royal house
- Constituents of Antioch, an overseas principality once
- Chinese dynasty finished in royal house
Buddy explains!

The straight part
We know that "house" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case house = hanover.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.