The most common and most likely answer to this crossword clue is the 4 plus 6 letter word HIGH OCTANE
I've seen this crossword clue in Independent
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More clues leading to the result HIGH OCTANE
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The straight part
We know that "dynamic" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case dynamic = high octane.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 HIGH OCTANE mean?
HIGH OCTANE adjective- (of fuel) Having a high octane number, good anti-knock characteristics; used in high performance vehicles.
- (by extension) High powered, energetic, forceful or dynamic.