Crossword Genius

Rely on spring to provide somewhere safe (4,5)

Ross

I believe the answer is:

bank vault

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'somewhere safe' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

'rely on spring' is the wordplay.
'rely' becomes 'bank'.
'on' says to put letters next to each other (in a down clue, letters appear on others).
'spring' becomes 'vault' (vaulting is a kind of springing).
'bank'+'vault'='BANK VAULT'

'to provide' acts as a link.

Can you help me to learn more?

I've seen this clue in The Daily Express.
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