What does the cryptic crossword clue "Go wrong filling pastry for French chap (6)" mean?

The wordplay uses a container (one word inside another). ERR (synonym="go wrong") in PIE (synonym="PIE") = PIERRE The answer is PIERRE.

Go wrong filling pastry for French chap (6)

Guardian Cryptic #29644 | 26 Across | 2025-03-17 flower