Synthetic material in name only abroad (5)
I believe the answer is:
nylon
'synthetic material' is the definition.
(I've seen this before)
'name only abroad' is the wordplay.
'name' becomes 'n' (common abbreviation e.g. on forms).
'abroad' indicates an anagram.
'only' is an anagram of 'ylon'.
'n'+'ylon'='NYLON'
'in' is the link.
(Other definitions for nylon that I've seen before include "Man-made fibre" , "Plastic used for stockings" , "Tights material" , "Type of material" , "Artificial fabric" .)