English Queen entertaining MP or another monarch (7)

I believe the answer is:

emperor

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'another monarch' is the definition.
'emperor' can be an answer for 'monarch' (emperor is a kind of monarch). I'm not sure about the 'another' bit.

'english queen entertaining mp or' is the wordplay.
'english' becomes 'E' (abbreviation).
'queen' becomes 'ER' (abbreviation for Elizabeth Regina).
'entertaining' means one lot of letters goes inside another (inviting in, as for dinner).
'e'+'er'='eer'
'eer' enclosing 'mp' is 'emper'.
'emper'+'or'='EMPEROR'

Can you help me to learn more?

(Other definitions for emperor that I've seen before include "Absolute ruler" , "Napoleon Bonaparte, for instance" , "Sovereign and richly-colored butterfly" , "A moth; a penguin" , "chap such as Charlemagne" .)

I've seen this clue in The Sun.

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