Gilliam's material (5)
I believe the answer is:
terry
This could be a double definition.
'gilliam's' is the first definition.
Both the definition and answer are singular nouns.
Perhaps you can see an association between them that I can't see?
'material' is the second definition.
(I know that terry is a type of material)
Can you help me to learn more?
(Other definitions for terry that I've seen before include "Towelling material" , "Fabric with piles" , "A man" , "Loop of pile fabric; England footballer" , "Terence (dim.)" .)