What does the cryptic crossword clue "9 this from recycled plutonium — guards look back, leaving depleted uranium (9)" mean?

The definition is "9 this". The wordplay uses an anagram. anagram of PLUTONI (synonym="PLUTONI") + LO (synonym="look") = POLLUTION; definition: "9 this" The answer is POLLUTION.

9 this from recycled plutonium — guards look back, leaving depleted uranium (9)

Guardian Cryptic #28914 | 14 Across | 2022-11-14 flower

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