What does the cryptic crossword clue "Beer with dirt tossed on top is well stupid (7)" mean?

The definition is "stupid". The wordplay uses a reversal. MUD (reversal="MUD") + BASS (synonym="BASS") = DUMBASS The answer is DUMBASS.

Beer with dirt tossed on top is well stupid (7)

Independent Cryptic #11914 | 1 Down | 2024-12-16 flower