Fabric for attorney's cloak (6)
I believe the answer is:
damask
'fabric' is the definition.
(damask is a kind of fabric)
'attorney's cloak' is the wordplay.
'attorney' becomes 'da' (District Attorney).
'cloak' becomes 'mask' ('mask' can be a synonym of 'cloak').
'da'+'mask'='DAMASK'
'for' is the link.
(Other definitions for damask that I've seen before include "heavy embossed table linen" , "Heavy embroidered linen" , "Rich, heavy fabric with a pattern woven into it, a tablecloth say" , "Lustrous cloth" , "Heavy patterned fabric" .)