Drink? Rare politician maintains resistance (6,4)

I believe the answer is:

bloody mary

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'drink?' is the definition.
(Bloody Mary is an example)

I don't understand how the remainder of the clue works.

(Other definitions for bloody mary that I've seen before include "killing Queen?" , "Vodka-based cocktail" , "something to drink" , "it could be an eye-opener" , "The Red Queen" .)

I've seen this clue in The Guardian.

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