Dusting powder (4)
I believe the answer is:
talc
'dusting 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 "It is used to absorb moisture" , "Scented powder used after bathing" , "Perfumed drying powder" , "Magnesium silicate powder" , "Fragrant powder" .)