Information not obtained from a high-up (3-4)

I believe the answer is:

low-down

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

I don't understand the rest of the clue.

(Other definitions for low-down that I've seen before include "Inside story" , "Mean, unfair" , "Inside information - mean (7;3-4)" , "Data - base" , "Info (slang) - dishonourable" .)

I've seen this clue in the Evening Standard.

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