Message from a key member in public transport (8)

I believe the answer is:

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

'a key member in public transport' is the wordplay.
'a key' becomes 'e' (I've seen this in other clues**).
'member' becomes 'leg' (I've seen this before).
'in' means one lot of letters goes inside another.
'public transport' becomes 'tram' (I've seen this before).
'e'+'leg'='eleg'
'eleg' put inside 'tram' is 'TELEGRAM'.

'from' is the link.

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

I've seen this clue in the Evening Standard.

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