Material something black and brown? (6)
I believe the answer is:
tartan
'material' is the definition.
(I know that tartan is a type of material)
'something black and brown?' is the wordplay.
'something black' becomes 'tar' (tar is a black substance).
'and' says to put letters next to each other.
'brown?' becomes 'tan' (tan is a kind of brown).
'tar'+'tan'='TARTAN'
(Other definitions for tartan that I've seen before include "Scottish woollen cloth" , "Woollen checked material" , "Distinctive pattern of a Scottish clan" , "Pattern of the Scottish clans" , "Scottish costume design" .)