What does the cryptic crossword clue "Controls big problem with app to be fixed by this (9)" mean?

The definition is "problem with app to be fixed by this". The wordplay uses a charade (building blocks). REINS (synonym="Controls") + TALL (synonym="big") = REINSTALL The answer is REINSTALL.

Controls big problem with app to be fixed by this (9)

Guardian Cryptic #29712 | 11 Across | 2025-06-04 flower

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