The most common and most likely answer to this crossword clue is the 7 letter word CALORIE
I've seen this crossword clue in The Daily Telegraph
C
A
L
O
R
I
E
More clues leading to the result CALORIE
- In tropical, oriental parts there’s some heat!
- A recoil released an amount of energy
- Energy unit – do not feature in air-cooled device
- California’s gold that is reference unit for consumers
- Bit of energy in éclair: unusually, about zero!
- Rubbish coal fire, failing to start, produces small amount of heat
- Heat produced by converting coal runs island energy
- Accountant with knowledge about independent unit
- Unit of heat, one of many counted by weight-watcher
Buddy explains!
The straight part
We know that "Bit of energy" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case bit of energy = calorie.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 CALORIE mean?
CALORIE noun- (nutrition) Kilogram calorie or large calorie. A unit of energy 1000 times larger than the gram calorie. It is equivalent to the gram kilocalorie, approximately 4.2 kilojoules.
- The gram calorie or small calorie, a non-SI unit of energy, equivalent to approximately 4.2 joules. This unit was widely used in chemistry and physics, being the amount of energy needed to raise the temperature of 1 gram of water by 1 °C.