Crossword Genius

Old at sea recline around an ___ ___ (5,5)

Ross

I believe the answer is:

ocean liner

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

'recline around an' is the definition.
I can't judge whether this defines the answer.

'old at sea' is the wordplay.
'old' becomes 'liner' (I can't justify this - if you can you should believe this answer much more).
'at' is a charade indicator (letters next to each other) (I've seen this in other clues).
'sea' becomes 'ocean' ('ocean' can be a synonym of 'sea').
'liner' put after 'ocean' is 'OCEAN LINER'.

Can you help me to learn more?

(Other definitions for ocean liner that I've seen before include "Cruise ship" , "Queen Mary, for example" , "Craft" .)

I've seen this clue in The Telegraph.
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