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Historic period, as a rule (7)

Ross

I believe the answer is:

regency

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

This could be a double definition.

'historic period' is the first definition.
'Regency' can be an answer for 'period' (Regency is an example). I am not sure about the 'historic' bit.

'a rule' is the second definition.
(I know that regency is a type of rule)

'as' acts as a link.

Can you help me to learn more?

(Other definitions for regency that I've seen before include "Periods of the Madness of King George when the Prince of Wales took over" , "British period, Eighteen-Eleven to Eighteen-Twenty" , "Period (1811-20) covering The Madness of King George III" , "Period of 1811 - 20" , "Period of king's incapacity" .)

I've seen this clue in the Evening Standard.
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