Pinched lid when sheltered (4,5)

I believe the answer is:

took cover

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'sheltered' is the definition.
Although both the answer and definition are past participle verbs, I don't understand how one could define the other.

'pinched lid' is the wordplay.
'pinched' becomes 'took' (I've seen this in another clue).
'lid' becomes 'cover' (I've seen this before).
'took'+'cover'='TOOK COVER'

'when' is the link.

Can you help me to learn more?

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

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