What does the cryptic crossword clue "Pure gunk on top of dustbin (4)" mean?

This cryptic clue uses wordplay to arrive at the answer. Visit the page for progressive hints — definition, wordplay type, and a full step-by-step explanation.

Pure gunk on top of dustbin (4)

Telegraph Prize Cryptic #3123 | 22 Down | 2021-08-29 flower

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