After-bath powder (6)
'after-bath powder' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for talc that I've seen before include "(Mineral providing) powder" , "Scented powder used after bathing" , "Cosmetic powder" , "White powder for the bathroom" , "Fine powder" .)
(Other definitions for talcum that I've seen before include "Popular scented body powder" , "Scented toilet powder" , "Bathroom powder" , "Kind of powder" , "Powder used on the body" .)