Drinker's comeuppance leaving grand house (7)

I believe the answer is:

hanover

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'house' is the definition.
(House of Hanover, European royal house)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for hanover that I've seen before include "Royal house from George I to Victoria" , "German 22 Across" , "foreign city" , "German town, and royal house" , "Royal house from 1727" .)

I've seen this clue in The Sun.

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