Medway town banning sick material (7)
I believe the answer is:
gingham
'material' is the definition.
(gingham is a kind of material)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for gingham that I've seen before include "Fabric in a plaid weave" , "Cotton cloth woven with coloured checks" , "Lightweight cotton cloth" , "Striped, or checked, cotton fabric" , "Light cotton checked fabric" .)