Cloth manufactured by a German and a Scotsman (7)
I believe the answer is:
hessian
'cloth' is the definition.
(I've seen this before)
'a german and a scotsman' is the wordplay.
'a german' becomes 'Hess' (German surname).
'and' means one lot of letters go next to another.
'a scotsman' becomes 'ian' (common Scottish name).
'hess'+'ian'='HESSIAN'
'manufactured by' is the link.
(Other definitions for hessian that I've seen before include "Cloth for sacking" , "Coarse cloth" , "sackcloth?" , "Coarse fabric used in sacks" , "Hemp, jute fabric" .)