Ship the inner packaging (5)

I believe the answer is:

liner

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

'ship' is the definition.
(as in an ocean liner)

I don't understand the rest of the clue.

(Other definitions for liner that I've seen before include "Cruise ship" , "that's put in bin" , "Passenger transport" , "Large passenger vessel" , "Removable inner skin or large passenger ship" .)

I've seen this clue in the Sydney Morning Herald.

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.