What does the cryptic crossword clue "Doctor who thought suffering and bereavement were for the best (8)" mean?

The wordplay uses a charade (building blocks). PANG (synonym="suffering") + LOSS (synonym="bereavement") = PANGLOSS The answer is PANGLOSS.

Doctor who thought suffering and bereavement were for the best (8)

Guardian Cryptic #29138 | 17 Down | 2023-08-02 flower