Instruction for barristers and aircrew (8)

I believe the answer is:

briefing

'instruction for barristers' is the definition.

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

(Other definitions for briefing that I've seen before include "Issuing instructions or giving information" , "Update session" , "Information (meeting)" , "Instructional meeting" , "Session to give information or instructions" .)

I've seen this clue in The Globe and Mail.

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