What does the cryptic crossword clue "Aunties swimming in Serpentine (7)" mean?

The wordplay uses an anagram. anagram of AUNTIES ("Aunties") [anagram: "swimming"] = SINUATE The answer is SINUATE.

Aunties swimming in Serpentine (7)

Guardian Cryptic #29436 | 25 Across | 2024-07-16 flower