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Smashing things made from flour mix using metric weights (9-4)

Ross

I believe the answer is:

battering-rams

I'm a little stuck... Click here to teach me more about this clue!

'flour mix using metric weights' is the definition.
I don't know anything about this answer so I can't judge whether this works.

'smashing things made from' is the wordplay.
I cannot quite understand how this works, but
'from' could be 'in' (I've seen this in other clues) and 'in' is present in the answer.
This may be the basis of clue (or it may be nonsense).

Can you help me to learn more?

I've seen this clue in The Telegraph.
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