A couple of Scotsmen leave Middle Eastern expanse (7,6)
I believe the answer is:
arabian desert
'middle eastern expanse' is the definition.
The answer and definition can be both locations as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'a couple of scotsmen leave' is the wordplay.
'a couple of scotsmen' becomes 'arabian' (I can't explain this - if you can you should believe this answer much more).
'leave' becomes 'desert' (desert can mean to leave or abandon).
'arabian'+'desert'='ARABIAN DESERT'
Can you help me to learn more?
(Another definition for arabian desert that I've seen is " Region between the Nile and Red sea".)