The most common and most likely answer to this crossword clue is the 7 letter word MIRACLE
I've seen this crossword clue in The Guardian
M
I
R
A
C
L
E
More clues leading to the result MIRACLE
- Length in major road race is something amazing
- The Spanish car reversing on motorway? Something unexpected probably
- Amazing motorway chase involving learner
- Great surprise of family vehicle turning up within distance
- … something extraordinary — er, claim is open to interpretation!
- Drivers get through distance that’s unnatural
- Sign with motorists in the distance
- Motorists seen in distance — it’s inexplicable
- Extraordinary thing, vehicle reversing into the distance
- Amazing event in distance holding vehicle up
Buddy explains!

The straight part
We know that "something extraordinary" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case something extraordinary = miracle.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 MIRACLE mean?
MIRACLE noun- An event that appears inexplicable by the laws of nature and so is held to be supernatural in origin.
- A fortunate outcome that prevails despite overwhelming odds against it.
- An awesome and exceptional example of something
- To affect by a miracle; to work a miracle upon.