Powder found in metal container (4)
I believe the answer is:
talc
'powder' is the definition.
(talcing is a kind of powdering)
'in metal container' is the wordplay.
'in' indicates the answer is hidden within the clue.
'TALC' is hidden in the letters of 'metal container'.
'found' is the link.
(Other definitions for talc that I've seen before include "It is used to absorb moisture" , "Fine powder" , "Softest substance in Mohs scale of hardness" , "After-bath powder" , "Cosmetic powder" .)