What does the cryptic crossword clue "Part of old sewer's altered after collapsing (7)" mean?

The definition is "Part". The wordplay uses an anagram. anagram of ALTERED ("altered") [anagram: "after"] = TREADLE; definition: "Part of old sewer's" The answer is TREADLE.

Part of old sewer's altered after collapsing (7)

Guardian Cryptic #28191 | 29 Across | 2020-07-21 flower

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