Grim end for the Titanic? (5)

I believe the answer is:

stern

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

'grim' is the definition.
(I know that grim can be written as stern)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for stern that I've seen before include "Poop" , "Severe; grimly serious" , "Strict - forbidding" , "Old star" , "Severe and unremitting: area of a ship" .)

I've seen this clue in The Times.

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