The "F" of F.B.I. (7)

I believe the answer is:

federal

(Other definitions for federal that I've seen before include "Relating to a form of government with power shared between the centre and the regions" , "in league" , "National, in the US" , "Relating to central government in the US" , "Lad-free (anag)" .)

I've seen this clue in The New York Times.

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