The most common and most likely answer to this crossword clue is the 10 letter word DEPOSITORY
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The straight part
We know that "maybe safe" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case maybe safe = depository.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 DEPOSITORY mean?
DEPOSITORY noun- A place where something is deposited, as for storage, safekeeping or preservation; a repository.
- A trustee; a depositary.