What does the cryptic crossword clue "Two containers floating in major lake (8,5)" mean?

The definition is "lake". The wordplay uses an anagram. anagram of TWO + CONTAINERS = CONISTONWATER; definition: "lake" The answer is CONISTONWATER.

Two containers floating in major lake (8,5)

Daily Mail Cryptic #17583 | 19 Across | 2025-03-26 flower