Spots one politician among plenty (7)

I believe the answer is:

pimples

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

'one politician among plenty' is the wordplay.
'one politician' becomes 'MP' (Member of Parliament).
'among' is an insertion indicator.
'plenty' becomes 'piles' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'mp' inserted into 'piles' is 'PIMPLES'.

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(Other definitions for pimples that I've seen before include "(Skin) spots" , "Small unsightly pustules on face" , "Rash" .)

I've seen this clue in the Evening Standard.

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