Crossword Genius

A badly cracked container (4)

Ross

I believe the answer is:

safe

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'container' is the definition.
(safe is a kind of container)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for safe that I've seen before include "Cash-box" , "Unharmed" , "Harmless" , "Out of harm's way" , "Secure cupboard" .)

I've seen this clue in the Evening Standard.
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