Demand Congress must release last of files (5)

I believe the answer is:

exact

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'demand' is the definition.
(I know that exact is a kind of demand)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for exact that I've seen before include "Precisely correct" , "Not approximate, precise" , "Precisely accurate" , "Call" , "correct in every detail" .)

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