Secure room for valuables (5)

I believe the answer is:

vault

(Other definitions for vault that I've seen before include "Crypt; leap" , "Where bodies may be kept" , "Strongroom or burial chamber" , "Leap - arched ceiling" , "Underground chamber - leap" .)

I've seen this clue in the Sydney Morning Herald.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.