Corrupt foundation (4)

I believe the answer is:

base

I believe this clue is a double definition.

'corrupt' is the first definition.
(thesaurus)

'foundation' is the second definition.
(synonyms)

(Other definitions for base that I've seen before include "Bottom support" , "Ignoble, military site" , "Interest charged by the Bank of England to commercial banks" , "unprincipled" , "Reprobate" .)

I've seen this clue in The Mirror.

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