What does the cryptic crossword clue "Treatment for a lunatic at sea? (8)" mean?

The definition is "sea?". The wordplay uses an anagram. anagram of ALUNATIC ("a lunatic") [anagram: "Treatment"] = NAUTICAL; definition: "at sea?" The answer is NAUTICAL.

Treatment for a lunatic at sea? (8)

Guardian Cryptic #27556 | 18 Down | 2018-07-09 flower

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