Significant briefing (7)

I believe the answer is:

telling

I believe this clue is a double definition.

'significant' is the first definition.
(I've seen this before)

'briefing' is the second definition.
(I've seen this before)

(Other definitions for telling that I've seen before include "Giving an order" , "Striking, having noticeable effect" , "briefing" , "Counting" , "Powerful; informing" .)

I've seen this clue in The Independent.

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