Article overturned argument made by discontented Lord - that's all we know (3,5)

'article overturned argument' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

'discontented lord that's all we know' is the wordplay.
I cannot quite see how this works, but
an anagram of 'lord' is 'orld' which is within the answer.
The remaining letters 'thew' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

'made by' is the link.

Can you help me to learn more?