What does the cryptic crossword clue "This could cause rustiness in old worker, say, after eleven days (7)" mean?

The definition is "This could cause rustiness". The wordplay uses a charade (building blocks). O (synonym="old") + XI (synonym="eleven") + D (synonym="days") + ANT (synonym="worker say") = OXIDANT; definition: "This could cause rustiness" The answer is OXIDANT.

This could cause rustiness in old worker, say, after eleven days (7)

Times Cryptic #29039 | 21 Down | 2024-10-04 flower

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