Mineral wealth meaning nothing to the Italian? (3)

I believe the answer is:

oil

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'mineral wealth' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.

'nothing to the italian?' is the wordplay.
'nothing' becomes 'O' (O resembles 0).
'to the italian?' becomes 'il' ('the' in Italian).
'o'+'il'='OIL'

'meaning' acts as a link.

Can you help me to learn more?

(Other definitions for oil that I've seen before include "Fuel, lubricant" , "SECOND PART OF 23" , "Lubricate; fuel" , "Grease" , "Valuable viscous liquid" .)

I've seen this clue in the Evening Standard.

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