One of vital cosmetics (4)
I believe the answer is:
talc
'one' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.
'of vital cosmetics' is the wordplay.
'of' says the answer is hidden in the clue.
'TALC' can be found hidden inside 'vital cosmetics'.
Can you help me to learn more?
(Other definitions for talc that I've seen before include "Softest mineral on Mohs hardness scale" , "(Mineral providing) powder" , "Powder used as toiletry" , "soother" , "I may dust" .)