The most common and most likely answer to this crossword clue is the 10 letter word PILEDRIVER
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More clues leading to the result PILEDRIVER
Buddy explains!

The straight part
We know that "Powerful shot" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case powerful shot = piledriver.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 PILEDRIVER mean?
PILEDRIVER noun- A machine for forcing a pile, a long beam, into the ground as part of the construction of a foundation; usually by raising a weight and then dropping it on the beam.
- A person who hits or attacks forcefully or powerfully.
- A move in which the wrestler applies a front waist lock, then drives the opponent's head into the mat by falling to his knees or backside.
- A very hard shot.