What does the cryptic crossword clue "Writer of poems enters wrestling with one (9)" mean?

The definition is "Writer". The wordplay uses an anagram. anagram of ENTERS + ONE = SONNETEER; definition: "Writer of poems" The answer is SONNETEER.

Writer of poems enters wrestling with one (9)

Independent Cryptic #11792 | 10 Across | 2024-07-26 flower