The most common and most likely answer to this crossword clue is the 8 letter word BLACKOUT
B
L
A
C
K
O
U
T
More clues leading to the result BLACKOUT
- Loss of power, shortage in fight
- Fit to tackle shortage for power cut
- Want nothing but to bring round from fainting fit
- Need to have match around for when it’s dark
- Deficiency during boxing match leads to loss of consciousness
- Switching lights off during air raid sounds like a racist order
- Give up, having been broken by large loss of energy?
Buddy explains!

The straight part
We know that "loss of energy" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case loss of energy = blackout.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 BLACKOUT mean?
BLACKOUT noun- A temporary loss of consciousness.
- A temporary loss of memory.
- An instance of censorship, especially a temporary one.
- A large-scale power failure, and resulting loss of electricity to consumers.
- The mandatory blocking of all light emanating from buildings as imposed during World War II.