Actor Caine can't mix cold drink (9,5)

I believe the answer is:

antarctic ocean

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'cold drink' is the definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.

'actor caine can't mix' is the wordplay.
'mix' is an anagram indicator.
'actor'+'caine'+'cant'='actorcainecant'
'actorcainecant' anagrammed gives 'ANTARCTIC OCEAN'.

Can you help me to learn more?

(Other definitions for antarctic ocean that I've seen before include "a lot of water" , "watery waste" , "Southern sea" .)

I've seen this clue in The Independent.

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