Crossword Genius

Like sale article at ground level? (7,4)

Ross

I believe the answer is:

knocked down

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'ground level?' is the definition.
The definition and answer can be both to do with contact as well as being past participle verbs.
Maybe they are linked in a way I don't understand?

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

Can you help me to learn more?

I've seen this clue in The Times.
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