Something Britain had from legislator in Ireland (6)

I believe the answer is:

empire

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'something britain had' is the definition.
I can't judge whether this defines the answer.

'legislator in ireland' is the wordplay.
'legislator' becomes 'MP' (Member of Parliament).
'in' is an insertion indicator.
'ireland' becomes 'eire' (poetic name for Ireland).
'mp' put into 'eire' is 'EMPIRE'.

'from' is the link.

Can you help me to learn more?

(Other definitions for empire that I've seen before include "Huge domain or group of companies" , "Corporation" , "Supreme power over many countries" , "Several states ruled over by a single monarch" , "Multinational" .)

I've seen this clue in The Guardian.

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