Cryptic crossword clue
Losing track of motorway carnage

The most common and most likely answer to this crossword clue is the 9 letter word MISLAYING

I've seen this crossword clue in The Guardian
M
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Buddy explains!

The straight part
We know that "Losing track of" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case losing track of = mislaying.
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.

What does MISLAYING mean?

MISLAYING verb
  1. To leave or lay something in the wrong place and then forget where one put it.

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