The most common and most likely answer to this crossword clue is the 3 plus 3 letter word LOG JAM
I've seen this crossword clue in The Daily Telegraph
L
O
G
J
A
M
More clues leading to the result LOG JAM
- Record spread of congestion
- Record crowd causes hold-up
- Major upset after record congestion
- Predicament coming after record congestion
- Note something sticky in blockage
- Record crowd causing standstill
- Congestion record spread
- Preserve on record what prevents progress
- Record predicament in bottleneck
- Record difficult situation that brings traffic to a standstill
Buddy explains!
The straight part
We know that "that brings traffic to a standstill" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case that brings traffic to a standstill = log jam.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.