Official document a hit perhaps (7)

I believe the answer is:

charter

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'official document' is the definition.
(charter is a kind of official document)

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

Can you help me to learn more?

(Other definitions for charter that I've seen before include "Hire (of aircraft/ship)" , "Let or hire a ship or plane" , "Written grant; hire" , "The hiring of a ship, plane or vehicle" , "Hire a boat or aircraft" .)

I've seen this clue in The Sun.

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