What does the cryptic crossword clue "Producer of fibre products is altering bags (5)" mean?

The definition is "Producer of fibre". The wordplay uses a hidden word. Hidden in "producer of fibre productS IS ALtering bags" The answer is SISAL.

Producer of fibre products is altering bags (5)

Times Cryptic #29060 | 22 Down | 2024-10-29 flower