US singer-songwriter formulated limits for Lasker-Noether theorem (3,6)

I believe the answer is:

tom lehrer

'us singer-songwriter' is the definition.

'formulated limits for lasker-noether theorem' is the wordplay.
I cannot really understand how this works, but
'for' could be 'to' (eg both can mean 'in the opinion of') and 'to' is located in the answer.
This may be the basis of clue (or it may be nonsense).

I've seen this clue in The Independent.

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