Cryptic crossword clue
Dynamite used on ground alongside places getting knocked over 10

The most common and most likely answer to this crossword clue is the 10 letter word STUPENDOUS

I've seen this crossword clue in Financial Times
S
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Buddy explains!

The straight part
We know that "Dynamite" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case dynamite = stupendous.
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 STUPENDOUS mean?

STUPENDOUS adjective
  1. Astonishingly great or large; huge; enormous.
  2. Of stunning excellence or degree; marvelous.

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