The most common and most likely answer to this crossword clue is the 3 plus 5 letter word ALL FOUND
I've seen this crossword clue in The Guardian
A
L
L
F
O
U
N
D
More clues leading to the result ALL FOUND
Buddy explains!

The straight part
We know that "Nothing lost/everything provided" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case nothing lost/everything provided = all found.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.