Agent with alias deployed somewhere in England (4,6)

I believe the answer is:

east anglia

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'somewhere in england' is the definition.
The definition suggests a singular noun which matches the answer.

'agent with alias deployed' is the wordplay.
'with' means one lot of letters go next to another.
'deployed' indicates an anagram.
'agent' put after 'alias' is 'aliasagent'.
'aliasagent' anagrammed gives 'EAST ANGLIA'.

Can you help me to learn more?

(Other definitions for east anglia that I've seen before include "old kingdom - with 25a" , "Norfolk, Suffolk, part of Essex and Cambridgeshire" , "English region" , "UK region" , "Region of England" .)

I've seen this clue in The Times.

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