What does the cryptic crossword clue "Neglect U.S. side requiring treatment (6)" mean?

The definition is "Neglect". The wordplay uses an anagram. anagram of U.S. + SIDE = DISUSE; definition: "Neglect" The answer is DISUSE.

Neglect U.S. side requiring treatment (6)

Daily Mail Cryptic #17210 | 23 Down | 2023-10-19 flower