Material taken by the barrister (4)
I believe the answer is:
silk
I believe this is a double definition.
'material' is the first definition.
(silk is a kind of material)
'the barrister' is the second definition.
(I've seen this before)
'taken by' acts as a link.
(Other definitions for silk that I've seen before include "Barman" , "Advocate" , "Fabric from larvae" , "Soft lustrous fabric" , "Ancient double-oared ship could be mire" .)