Empty vault (5)

I believe the answer is:

clear

This clue is a double definition.

'empty' is the first definition.
(thesaurus)

'vault' is the second definition.
(thesaurus)

(Other definitions for clear that I've seen before include "Bold" , "Transparent, easy to see through" , "Make a profit - brighten up" , "Unimpeded" , "Easily understood" .)

I've seen this clue in The Guardian and The Telegraph.

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