Cryptic crossword clue
Roadside observers a Merc passed travelling around Spain 5,7

The most common and most likely answer to this crossword clue is the 5 plus 7 letter word SPEED CAMERAS

I've seen this crossword clue in The Daily Telegraph
S
P
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S

Buddy explains!

The straight part
We know that "Roadside observers" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case roadside observers = speed cameras.
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.

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