Commercial letters for remote station (7,4)
I believe the answer is:
trading post
'remote station' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps there's an association between them I don't understand?
'commercial letters' is the wordplay.
'commercial' becomes 'trading' (I can't justify this - if you can you should believe this answer much more).
'letters' becomes 'post' (letters in the mail or post).
'trading'+'post'='TRADING POST'
'for' is the link.
Can you help me to learn more?
(Other definitions for trading post that I've seen before include "general store" , "store in a remote area" , "Store in a remote place" , "Remote supplier" .)