Mineral wealth means nothing to the Italian (3)
I believe the answer is:
oil
'mineral wealth means' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps there's an association between them I don't understand?
'nothing to the italian' is the wordplay.
'nothing' becomes 'O' (looks like zero - 0).
'to the italian' becomes 'il' ('the' in Italian).
'o'+'il'='OIL'
Can you help me to learn more?
(Other definitions for oil that I've seen before include "Grease" , "Greasy liquid" , "Slippery liquid" , "SECOND PART OF 23" , "Black gold" .)