Spot foreign politician ensconced in stately home (6)

I believe the answer is:

pimple

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'spot' is the definition.
(I've seen this before)

'foreign politician ensconced in stately home' is the wordplay.
'foreign politician' becomes 'mp' (Member of Parliament. I am not sure about the 'foreign' bit.).
'ensconced in' indicates putting letters inside.
'stately home' becomes 'pile' (I've seen this in other clues).
'mp' going inside 'pile' is 'PIMPLE'.

Can you help me to learn more?

(Other definitions for pimple that I've seen before include "Small pustule" , "Inflamed skin spot" .)

I've seen this clue in The Irish Times and the Irish Times (Crosaire).

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