What does the cryptic crossword clue "Municipal building in USA involved with moonshine (7,5)" mean?

The definition is "Municipal". The wordplay uses an anagram. anagram of USA MOONSHINE = MANSIONHOUSE The answer is MANSIONHOUSE.

Municipal building in USA involved with moonshine (7,5)

Guardian Cryptic #29449 | 12 Across | 2024-07-31 flower