Jam session before or after work? (4,4)
I believe the answer is:
rush hour
'jam session' is the definition.
The definition and answer can be both related to time as well as being singular nouns.
Maybe there's an association between them I don't understand?
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for rush hour that I've seen before include "When most people are going to or coming from work" , "Busy time for traffic" , "lot of coming and going" , "Weekday crush of people and cars" , "Time when traffic is heaviest" .)