Quick transport announcement about shortened tram (6,5)
I believe the answer is:
bullet train
'quick transport' is the definition.
I don't know anything about this answer so I can't judge whether this works.
'announcement about shortened tram' is the wordplay.
'announcement' becomes 'bulletin' (I can't justify this - if you can you should believe this answer much more).
'about' means one lot of letters goes inside another.
'shortened' means to remove the last letter.
'tram' with its final letter removed is 'tra'.
'bulletin' going around 'tra' is 'BULLET TRAIN'.
Can you help me to learn more?
(Other definitions for bullet train that I've seen before include "it travels quickly" , "Japanese high-speed transport" , "Get to work on it fast!" .)