I need source of metal, Al? Wrong! (4,4)

I believe the answer is:

lead mine

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'i need source of metal al? wrong' is the definition.
I don't know anything about this answer so I can't tell whether this works.

'i need source of metal al? wrong' is the wordplay.
'source of' indicates taking the first letters (the start - or source - of the word).
'wrong' indicates anagramming the letters.
The initial letter of 'metal' is 'm'.
'i'+'need'+'m'+'al'='ineedmal'
'ineedmal' is an anagram of 'LEAD MINE'.

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I've seen this clue in The Guardian.

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