What does the cryptic crossword clue "Amend year's-end VAT for 11th of November in the US (11)" mean?

The wordplay uses an anagram. anagram of YEAR'S-END + VAT = VETERANSDAY The answer is VETERANSDAY.

Amend year's-end VAT for 11th of November in the US (11)

Independent Cryptic #11859 | 4 Down | 2024-10-12 flower