What does the cryptic crossword clue "Area of France that's almost too brill! (6)" mean?

The wordplay uses a charade (building blocks). ALS (synonym="ALS") + ACE (synonym="brill") = ALSACE The answer is ALSACE.

Area of France that's almost too brill! (6)

Guardian Cryptic #29287 | 1 Down | 2024-01-24 flower