Baby powder (4)
'baby 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 "Bathroom powder (abbr)" , "(Mineral providing) powder" , "Soft stuff" , "I may dust" , "Toilet powder - mica" .)
(Other definitions for talcum that I've seen before include "Standard body powder" , "Bathroom powder" , "Soft powder" , "Kind of powder" , "Dusting powder" .)