What does the cryptic crossword clue "Anna and Tom resettled in U.S. state (7)" mean?

The definition is "state". The wordplay uses an anagram. anagram of ANNA + TOM = MONTANA; definition: "state" The answer is MONTANA.

Anna and Tom resettled in U.S. state (7)

Daily Mail Cryptic #17245 | 9 Across | 2023-12-07 flower