Can require some heating (3)

I believe the answer is:

tin

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

'can' is the definition.
(both are metal containers)

'require some heating' is the wordplay.
'TIN' is hidden within the letters.
But, I'm unsure how this is indicated.

Can you help me to learn more?

(Other definitions for tin that I've seen before include "Silvery-white metallic element" , "Earnings" , "Cornish metal?" , "A silvery-white metal often in cans" , "Light metal" .)

I've seen this clue in the Evening Standard.

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