The foreign editor, in plush surroundings (7)
I believe the answer is:
swedish
'plush surroundings' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.
'the foreign editor in' is the wordplay.
'the foreign' becomes 'swish' (I can't justify this - if you can you should believe this answer much more).
'editor' becomes 'ed' (abbreviation).
'in' is an insertion indicator.
'swish' enclosing 'ed' is 'SWEDISH'.
Can you help me to learn more?
(Other definitions for swedish that I've seen before include "Nationality that swished around" , "from European country" , "From Uppsala, perhaps" , "Soprano Jenny Lind, b. Stockholm 1798, d. Herefordshire 1887" , "Nordic" .)