It's used for wrapping metal sword (7)

I believe the answer is:

tinfoil

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'it's used for wrapping' is the definition.
I can't judge whether this defines the answer.

'metal sword' is the wordplay.
'metal' becomes 'tin' (tin is a kind of metal).
'sword' becomes 'foil' (foil is a kind of sword).
'tin'+'foil'='TINFOIL'

Can you help me to learn more?

(Other definitions for tinfoil that I've seen before include "Food wrapper" , "Metallic sheeting used for cooking" , "Thin metallic sheets for protecting food" , "Fine metal" , "Shiny food wrapping" .)

I've seen this clue in The Irish News.

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