This is used as an insulator in the ceramic arts (4)
I believe the answer is:
mica
'this is used as an insulator' is the definition.
The definition suggests a singular noun which matches the answer.
'in the ceramic arts' is the wordplay.
'in' indicates a hidden word.
'MICA' can be found hidden inside 'ceramic arts'.
Can you help me to learn more?
(Other definitions for mica that I've seen before include "Flexible mineral found in igneous and metamorphic rocks" , "Transparent mineral" , "Semitransparent insulating mineral" , "Shiny silicate mineral" , "Muscovite with perfect cleavage" .)