What does the cryptic crossword clue "Bill's solution penetrates synthetic materials (10)" mean?

The definition is "materials". The wordplay uses a container (one word inside another). LYE (synonym="LYE") in POSTERS (synonym="POSTERS") = POLYESTERS; definition: "materials" The answer is POLYESTERS.

Bill's solution penetrates synthetic materials (10)

Times Cryptic #28966 | 8 Down | 2024-07-11 flower

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