What does the cryptic crossword clue "Top viral infection expert achieving through chance (7)" mean?

The definition is "achieving through chance". The wordplay uses a charade (building blocks). FLU (synonym="FLU") + KING (synonym="‘top viral infection expert’") = FLUKING; definition: "achieving through chance" The answer is FLUKING.

Top viral infection expert achieving through chance (7)

Guardian Cryptic #29192 | 20 Down | 2023-10-04 flower

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