The most common and most likely answer to this crossword clue is the 5 letter word TOTAL
I've seen this crossword clue in Independent
T
O
T
A
L
More clues leading to the result TOTAL
- Child learner seen around a comprehensive
- Complete stop as outsiders leave — speech unfinished
- Come to wreck
- Tiny child with a large sum
- Write off sum
- Closed discussion? Not quite complete
- The whole time a lot developed
- Write off note kid returned
- Complete tons of tests assessing liabilities at first
- Young child attending a large comprehensive
Buddy explains!

The straight part
We know that "everything" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case everything = total.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 TOTAL mean?
TOTAL noun- An amount obtained by the addition of smaller amounts.
- Sum.
- To add up; to calculate the sum of.
- To equal a total of; to amount to.
- To demolish; to wreck completely. (from total loss)
- To amount to; to add up to.
- Entire; relating to the whole of something.
- (used as an intensifier) Complete; absolute.