A sweater specially designed for the ocean (3,5)

I believe the answer is:

sea water

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

'the ocean' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.

'a sweater specially designed' is the wordplay.
'specially designed' indicates anagramming the letters (I've seen this in other clues).
'a'+'sweater'='asweater'
'asweater' with letters rearranged gives 'SEA-WATER'.

'for' is the link.

Can you help me to learn more?

(Another definition for sea water that I've seen is " brine".)

I've seen this clue in The Globe and Mail.

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