Half the street takes on bride's mate at The Vault (10)

I believe the answer is:

strongroom

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'the vault' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe you can see an association between them that I don't see?

'half the street takes on bride's mate' is the wordplay.
'half the' indicates taking half.
'takes' means one lot of letters go next to another.
'bride's mate' becomes 'groom' (I've seen this in another clue).
'street' cut in half is 'str'.
'str'+'on'+'groom'='STRONGROOM'

'at' is the link.

Can you help me to learn more?

(Other definitions for strongroom that I've seen before include "safe place" , "Bank vault" .)

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

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