Crossword Genius

Marine personnel reported for sea trip (6)

Ross

I believe the answer is:

cruise

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

'sea trip' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for cruise that I've seen before include "Holiday on liner" , "Shipboard holiday" , "Ship holiday" , "Sail on a ship" , "Sea trip" .)

I've seen this clue in The Independent.
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