Cold material used for drawing (6)
I believe the answer is:
crayon
'for drawing' is the definition.
(can mean a particular drawing done with crayons)
'cold material' is the wordplay.
'cold' becomes 'c' (eg on taps).
'material' becomes 'rayon' (type of fabric).
'c'+'rayon'='CRAYON'
'used' is the link.
(Other definitions for crayon that I've seen before include "Drawing implement" , "Producer of sketch" , "Stick of coloured wax for drawing (6)" , "Drawing pen" , "Wax pen" .)