Message sent back about American station in London (6)
I believe the answer is:
euston
'station in london' is the definition.
'euston' can be an answer for 'station' (London train station). I'm not certain of the 'in london' bit.
'message sent back about american' is the wordplay.
'message' becomes 'note' (note is a kind of message).
'sent back' shows that the letters should be reversed in order.
'about' indicates putting letters inside.
'american' becomes 'US' (abbreviation for United States).
'note' back-to-front is 'eton'.
'eton' going around 'us' is 'EUSTON'.
Can you help me to learn more?
(Other definitions for euston that I've seen before include "North London terminus" , "trains here in London?" , "north London area" , "Brown seaweed" , "London rail terminus" .)