Crossword Genius

Sanction capital city, ignoring Fifth Amendment (8)

Ross

I believe the answer is:

accredit

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'sanction' is the definition.
(I've seen this in another clue)

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

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(Other definitions for accredit that I've seen before include "Show to be correct" , "Accept as true" , "Give authority or sanction to" , "Endorse" , "Appoint" .)

I've seen this clue in The Times.
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