Crossword Genius

Official authorisation (9)

Ross

I believe the answer is:

clearance

'official authorisation' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for clearance that I've seen before include "Permission to proceed" , "OK" , "Vacation" , "Sanction" , "Green light" .)

I've seen this clue in The Sun.
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