What does the cryptic crossword clue "Chaperones fly in to be trained in 1 Across territory (6,9)" mean?

The wordplay uses an anagram. anagram of CHAPERONES + FLY + IN = FRENCHPOLYNESIA The answer is FRENCHPOLYNESIA.

Chaperones fly in to be trained in 1 Across territory (6,9)

Daily Mail Cryptic #16941 | 7 Down | 2022-10-07 flower