The most common and most likely answer to this crossword clue is the 6 letter word QUANTA
I've seen this crossword clue in Independent
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More clues leading to the result QUANTA
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The straight part
We know that "Small amounts of energy" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case small amounts of energy = quanta.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 QUANTA mean?
QUANTA noun- The total amount of something; quantity.
- The amount or quantity observably present, or available.
- The smallest possible, and therefore indivisible, unit of a given quantity or quantifiable phenomenon.
- A definite portion of a manifoldness, limited by a mark or by a boundary.
- A brief document provided by the judge, elaborating on a sentencing decision.
- The amount of time allocated for a thread to perform its work in a multithreaded environment.