What does the cryptic crossword clue "Dream I'm in boat at sea (8)" mean?

The definition is "Dream". The wordplay uses an anagram. anagram of I'M + IN + BOAT = AMBITION; definition: "Dream" The answer is AMBITION.

Dream I'm in boat at sea (8)

Independent Cryptic #11727 | 13 Down | 2024-05-11 flower