Cryptic crossword clue
It records speed on river 7

The most common and most likely answer to this crossword clue is the 7 letter word DASHCAM

I've seen this crossword clue in The Guardian
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The straight part
We know that "It records" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case it records = dashcam.
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 DASHCAM mean?

DASHCAM noun
  1. A digital video recorder mounted on the dashboard of a vehicle or elsewhere inside the vehicle to record occurrences in the vicinity, such as traffic accidents that the vehicle has been involved in, to provide evidence for criminal prosecutions, insurance claims, etc.

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