Confidential information at the bottom? (7)

I believe the answer is:

lowdown

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'confidential information' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

(Other definitions for lowdown that I've seen before include "base" , "confidential information" , "Data" , "Inside information - mean" , "Dope" .)

I've seen this clue in The Times.

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