Reported claim of captain destroying enemy ship -- something giving sailors security? (3,6)

I believe the answer is:

ice anchor

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

'security?' is the definition.
Both the definition and answer are singular nouns.
Perhaps there's an association between them I don't understand?

I don't understand how the remainder of the clue works.

Can you help me to learn more?

I've seen this clue in The Telegraph.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.