Cryptic crossword clue
A bit of drama curtailed, 7 perhaps being the dominating power 10

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

I've seen this crossword clue in The Daily Telegraph
A
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Buddy explains!

The straight part
We know that "the dominating power" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case the dominating power = ascendance.
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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