Crossword Genius

Nature's provision of shelter for sailors? (6)

Ross

I believe the answer is:

cavern

I'm a little stuck... Click here to teach me more about this clue!

'nature's' is the definition.
The definition and answer can be both natural objects as well as being singular nouns.
Perhaps you can see a link between them that I don't see?

'provision of shelter for sailors?' is the wordplay.
'provision of shelter for' becomes 'cave' (I can't justify this - if you can you should believe this answer much more).
'sailors?' becomes 'RN' (abbreviation for Royal Navy).
'cave'+'rn'='CAVERN'

Can you help me to learn more?

(Other definitions for cavern that I've seen before include "Grotto" , "Detection device" , "Subterranean chamber" , "Large 24 chamber" , "Craven in a cave" .)

I've seen this clue in the Evening Standard.
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