Most powdery food has been put down inside? (8)

I believe the answer is:

mealiest

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'most powdery' is the definition.
Both the answer and definition are superlative adjectives. Maybe you can see an association between them that I don't see?

'food has been put down inside?' is the wordplay.
I cannot quite understand how this works, but
'food' could be 'meal' (meal is a kind of food) and 'meal' is located in the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

I've seen this clue in The Times.

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