What does the cryptic crossword clue "Drill then dart for twice-daily pain? (6,3)" mean?

The wordplay uses a charade (building blocks). SCHOOL (synonym="drill") + RUN (synonym="dart") = SCHOOLRUN The answer is SCHOOLRUN.

Drill then dart for twice-daily pain? (6,3)

Guardian Cryptic #29641 | 7 Across | 2025-03-13 flower