Spot British politician entering grand mansion (6)

I believe the answer is:

pimple

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

'british politician entering grand mansion' is the wordplay.
'british politician' becomes 'MP' (Member of Parliament).
'entering' indicates putting letters inside.
'grand mansion' becomes 'pile' (pile can mean a large building. I am not sure about the 'grand' bit.).
'mp' going inside 'pile' is 'PIMPLE'.

Can you help me to learn more?

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

I've seen this clue in The Irish Times.

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