What does the cryptic crossword clue "Labour in 2024? A lot are switching (7)" mean?

The wordplay uses an anagram. anagram of MANY (synonym="=a lot") + ARE (synonym="ARE") = MANYEAR The answer is MANYEAR.

Labour in 2024? A lot are switching (7)

Independent Cryptic #11826 | 21 Down | 2024-09-04 flower