Which tool could make newt churn? (3-6)

I believe the answer is:

nut-wrench

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'which tool' is the definition.
I don't know anything about this answer so I can't tell whether this works.

'make newt churn?' is the wordplay.
'make' indicates anagramming the letters.
'newt'+'churn'='newtchurn'
'newtchurn' is an anagram of 'NUT-WRENCH'.

'could' acts as a link.

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.

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