Material thought (4)
I believe the answer is:
felt
I believe this clue is a double definition.
'material' is the first definition.
(felt is a kind of material)
'thought' is the second definition.
(feeling is a kind of thinking)
(Other definitions for felt that I've seen before include "Touched - experienced" , "Experienced, say, emotion" , "Cloth of matted fibres; experienced" , "Fabric of matted wool fibres" , "It's reckoned" .)