Late news: 'Jam following work on street' (4,5)
I believe the answer is:
stop press
'late news' is the definition.
(I've seen this before)
'jam following work on street' is the wordplay.
'jam' becomes 'press' ('press' can be a synonym of 'jam').
'following' means one lot of letters go next to another.
'work on street' becomes 'stop' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'press' after 'stop' is 'STOP-PRESS'.
Can you help me to learn more?
(Other definitions for stop press that I've seen before include "newspaper feature" , "Hold the front page!" , "Late breaking news" , "Late news item(s)" , "Latest news" .)