White substance found in metal container (4)

I believe the answer is:

talc

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'white substance' is the definition.
'talc' can be an answer for 'substance' (talc is a kind of substance). I am not sure about the 'white' bit.

'found in metal container' is the wordplay.
'found in' says the answer is hidden in the clue.
'TALC' can be found hidden inside 'metal container'.

Can you help me to learn more?

(Other definitions for talc that I've seen before include "soother" , "Mica - scented body powder" , "Baby powder" , "White powder for the bathroom" , "Toilet powder - mica" .)

I've seen this clue in The Irish Times.

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