Cryptic crossword clue
Vault below sea-level containing empty chair 10

The most common and most likely answer to this crossword clue is the 10 letter word UNDERCROFT

I've seen this crossword clue in Financial Times
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Buddy explains!

The straight part
We know that "Vault" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case vault = undercroft.
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 UNDERCROFT mean?

UNDERCROFT noun
  1. A cellar or vaulted storage room.
  2. A ground-level car park that occupies the base of a building.

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