Mineral used in the ceramic arts (4)
I believe the answer is:
mica
'mineral' is the definition.
(mica is a kind of mineral)
'in the ceramic arts' is the wordplay.
'in' indicates the answer is hidden within the clue.
'MICA' is hidden within 'ceramic arts'.
'used' acts as a link.
(Other definitions for mica that I've seen before include "Shiny silicate mineral" , "Flexible mineral found in igneous and metamorphic rocks" , "Muscovite with perfect cleavage" , "Isinglass" , "Transparent mineral" .)