What does the cryptic crossword clue "Loud duo regularly observed in board game (4)" mean?

The definition is "board game". The wordplay uses an anagram. anagram of LOUD = LUDO; definition: "board game" The answer is LUDO.

Loud duo regularly observed in board game (4)

Daily Mail Cryptic #17298 | 12 Across | 2024-02-21 flower