What does the cryptic crossword clue "Prison reformer's quick meal (4-3)" mean?

The wordplay uses a charade (building blocks). STIR (synonym of "quick meal") + FRY (synonym of "Prison reformer's") The answer is STIR-FRY.

Prison reformer's quick meal (4-3)

Times Cryptic #29127 | 9 Across | 2025-01-15 flower