The most common and most likely answer to this crossword clue is the 5 plus 6 letter word SPEED CAMERA
I've seen this crossword clue in The Guardian
S
P
E
E
D
C
A
M
E
R
A
More clues leading to the result SPEED CAMERA
- One providing evidence in drive-by shooting
- One likely to snap at those driving over limit
- Reads pace, devised to catch one? It does
- Half-heartedly passed a Merc stupidly conserving energy — one could be caught by it?
- Excessive on reflection, a Merc flying is caught by it?
- A Merc with ease passed on the outside activating this?
- What might capture escaped mare panicking?
- Equipment for rapid auto-detection in ticketing system
- Visiting sister, went and arrived with a progress check
- Zoom lens that’s employed covertly, by the way
Buddy explains!
The straight part
We know that "progress check" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case progress check = speed camera.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.