Constituents of Antioch, an overseas principality once (7)

I believe the answer is:

hanover

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'constituents of' is the definition.
The definition suggests a singular noun which matches the answer.

'antioch an overseas principality once' is the wordplay.
'HANOVER' is hidden in amongst the letters.
However, I'm unsure how this is indicated.

Can you help me to learn more?

(Other definitions for hanover that I've seen before include "Royal house from 1727" , "German town, and royal house" , "Royal house from George I to Victoria" , "British dynasty" , "Royal house of Britain 1714-1901" .)

I've seen this clue in The Everyman puzzle in The Observer.

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