What does the cryptic crossword clue ""Tauten line", ordered the naval officer (10)" mean?

The definition is "officer". The wordplay uses an anagram. anagram of "TAUTEN + LINE", = LIEUTENANT; definition: "officer" The answer is LIEUTENANT.

"Tauten line", ordered the naval officer (10)

Guardian Cryptic #23778 | 15 Across | 2006-05-29 flower