What does the cryptic crossword clue "A target at sea for a boating event (7)" mean?

The definition is "boating event". The wordplay uses an anagram. anagram of A + TARGET = REGATTA; definition: "boating event" The answer is REGATTA.

A target at sea for a boating event (7)

Daily Mail Cryptic #17087 | 6 Down | 2023-05-01 flower