The most common and most likely answer to this crossword clue is the 4 letter word WATT
I've seen this crossword clue in The Guardian
W
A
T
T
More clues leading to the result WATT
- Reportedly, what our energy bill is based on?
- Power unit, where I didn't hear sounds
- Weight around a ton gives a measure of power
- Scotsman who showed the importance of the transfer of power
- Some power revolting leader’s half lost
- Quantity of power, with a doubling of temperature
- Engineer, __ did you say, did you say?
- Need to take time to replace new engineer
- Washington Times: The Measure of Power
- Question in audience for inventor
Buddy explains!

The straight part
We know that "Some power" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case some power = watt.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 WATT mean?
WATT noun- In the International System of Units, the derived unit of power; the power of a system in which one joule of energy is transferred per second. Symbol: W