Take cover (6)
This clue could be a double definition.
'take' is the first definition.
The answer and definition can be both related to thinking as well as being verbs in their base form.
Perhaps there's a link between them I don't understand?
'cover' is the second definition.
(synonyms)
Can you help me to learn more?
(Other definitions for insure that I've seen before include "Guarantee against loss" , "Guarantee; make secure" , "Protect value through contract" , "Arrange for payment in the event of loss" , "Take out a policy" .)
(Other definitions for shelter that I've seen before include "retreat" , "Let hers go into shielded place" , "Protection; charity for the homeless" , "Monk's hood" , "Refuge; protect" .)