The most common and most likely answer to this crossword clue is the 10 letter word REGISTRIES
I've seen this crossword clue in Financial Times
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More clues leading to the result REGISTRIES
Buddy explains!

The straight part
We know that "places for documents" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case places for documents = registries.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 REGISTRIES mean?
REGISTRIES noun- A building in which things are registered or where registers are kept.
- A record; an account; a register.
- The act of registering; registration.
- A database of configuration settings etc. maintained by the Microsoft Windows operating system.