Mineral component of dental crowns (4)

I believe the answer is:

talc

'mineral' is the definition.
(I know that talc is a type of mineral)

'component of dental crowns' is the wordplay.
'component of' says the answer is hidden in the clue (I've seen this in other clues).
'TALC' can be found hidden inside 'dental crowns'.

(Other definitions for talc that I've seen before include "Drier" , "Mineral used as a toiletry" , "Baby powder" , "Fine powder" , "Fragrant powder" .)

I've seen this clue in The Independent.

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