Turn to evidence that's sheltered (9)

I believe the answer is:

windproof

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'sheltered' is the definition.
Both the answer and definition are adjectives.
Maybe they are linked in a way I don't understand?

'turn to evidence' is the wordplay.
'turn' becomes 'wind' (I've seen this in another clue).
'to evidence' becomes 'proof' (evidence proves something).
'wind'+'proof'='WINDPROOF'

'that's' acts as a link.

Can you help me to learn more?

(Another definition for windproof that I've seen is " Protecting from cold air".)

I've seen this clue in The Daily Express.

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