Mail leaving remote station? (7)
I believe the answer is:
outpost
'station?' is the definition.
(outpost is a kind of station)
'mail leaving remote' is the wordplay.
I cannot quite see how this works, but
'mail' could be 'post' (synonyms) and 'post' is located in the answer.
'remote' could be 'out' (I've seen this in other clues) and 'out' is present in the answer.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for outpost that I've seen before include "A distant branch or settlement" , "Remote military site" , "Remote stronghold" , "isolated settlement" , "Remote part of the country" .)