Quick transport announcement about shortened tram (6,5)
I believe the answer is:
bullet train
'quick transport' is the definition.
I know nothing about this answer so I can't judge whether this works.
'announcement about shortened tram' is the wordplay.
'announcement' becomes 'bulletin' (I can't explain this - if you can you should give a lot more credence to this answer).
'about' indicates putting letters inside.
'shortened' means to remove the last letter.
'tram' with its last letter taken off is 'tra'.
'bulletin' enclosing '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!" .)