Run over, as Mike admits hiding diamonds (4,4)

I believe the answer is:
mown down
'run over' is the definition.
The answer and definition are not the same part of speech. However, adjectives and past participle verbs can sometimes mean the same thing.
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 Independent.
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