Cryptic crossword clue
A rock overturned with what, from the sound of it, is a lot of power 8

The most common and most likely answer to this crossword clue is the 8 letter word MEGAWATT

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

The straight part
We know that "is a lot of power" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case is a lot of power = megawatt.
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 MEGAWATT mean?

MEGAWATT noun
  1. One million (1 000 000) watts, abbreviated as MW.

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