What does the cryptic crossword clue "U.S. slum? It is redeveloped getting boost (8)" mean?

The wordplay uses an anagram. anagram of U.S. + SLUM? + IT = STIMULUS The answer is STIMULUS.

U.S. slum? It is redeveloped getting boost (8)

Daily Mail Cryptic #16969 | 31 Across | 2022-11-16 flower