Opening remark in ship on Arctic? (3-7)

I believe the answer is:

ice-breaker

This clue is a double definition.

'opening remark' is the first definition.
(remark used to 'break the ice' socially)

'ship on arctic?' is the second definition.
(vessel designed to break through ice)

'in' is the link.

(Another definition for ice-breaker that I've seen is " Something to relax social tension".)

I've seen this clue in The Times.

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