Message from overseas: ROUTE’S LAST STAGE ABOARD PUBLIC TRANSPORT (8)

I believe the answer is:

I'm a little stuck... Click here to teach me more about this clue!

'message' is the definition.
(telegram is a kind of message)

'route's last stage aboard public transport' is the wordplay.
'last' suggests the final letters.
'stage' becomes 'leg' (a leg is a stage of a competition).
'aboard' is an insertion indicator.
'public transport' becomes 'tram' (type of public transport).
The last letter of 'route' is 'e'.
'e'+'leg'='eleg'
'eleg' going inside 'tram' is 'TELEGRAM'.

'from overseas' is the link.
I am not very happy about this link. Some or all of it may be part of another bit of the clue.

Can you help me to learn more?

(Other definitions for telegram that I've seen before include "Message transmitted by wire" , "Dispatch" , "Now obsolete communication over a wire" , "Message once sent by radio or electrical signals" , "Pre-1980s electronic message" .)

Want a hint initially instead of a full solution? Install my app