Former monarchy’s ideal is to lose power (6)

I believe the answer is:

aragon

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'power' is the definition.
Both the definition and answer are singular nouns.
Perhaps there's an association between them I don't understand?

I can't explain the rest of the clue.

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(Other definitions for aragon that I've seen before include "French poet" , "Old Spanish kingdom" , "(7 of) Henry's first" , "part of Spain" , "Former Spanish kingdom" .)

I've seen this clue in The Times.

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