Cocaine distilled from the sea (7)

I believe the answer is:

oceanic

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'sea' is the definition.
(similar in meaning)

'cocaine distilled from the' is the wordplay.
'cocaine' anagrams to 'OCEANIC'.
But, I'm not clear how the anagram is indicated.

Can you help me to learn more?

(Other definitions for oceanic that I've seen before include "In deep water" , "Pelagic" , "description of rollers" , "Relating to great seas" , "Like the main" .)

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

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