Linger round an old royal house (7)

I believe the answer is:

hanover

I'm a little stuck... Click here to teach me more about this clue!

'royal house' is the definition.
(Hanover is an example)

'linger round an' is the wordplay.
'linger' becomes 'hover' (synonyms).
'round' means one lot of letters goes inside another.
'hover' placed around 'an' is 'HANOVER'.

'old' is the link.
I am not very happy about this link. It may belong to another bit of the clue.

Can you help me to learn more?

(Other definitions for hanover that I've seen before include "British royal house, 1714 to 1901" , "Royal house from George I to Victoria" , "Royal house of Britain 1714-1901" , "10 [HOUSE]" , "German 22 Across" .)

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