Giant I caught leaving doomed ship (5)

I believe the answer is:

titan

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'giant' is the definition.
(I know that giant can be written as titan)

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

Can you help me to learn more?

(Other definitions for titan that I've seen before include "distant moon" , "colossal one" , "one of great importance" , "heavyweight?" , "One huge" .)

I've seen this clue in The Sun.

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