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Food supplier who tested mineral (9)

Ross

I believe the answer is:

provedore

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'food supplier' is the definition.
'provedore' can be an answer for 'supplier' (I've seen this before). I'm unsure of the 'food' bit.

'tested mineral' is the wordplay.
'tested' becomes 'proved' (similar in meaning).
'mineral' becomes 'ore' (ore is a kind of mineral).
'proved'+'ore'='PROVEDORE'

'who' is the link.

Can you help me to learn more?

(Another definition for provedore that I've seen is " Supplier".)

I've seen this clue in the Sydney Morning Herald.
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