What does the cryptic crossword clue "Uncontaminated, set free over bug (7)" mean?

The definition is "Uncontaminated,". The wordplay uses anagram, charade. anagram of SET ("set") + RILE (synonym of "bug") [anagram: "free"] = STERILE; definition: "Uncontaminated," The answer is STERILE.

Uncontaminated, set free over bug (7)

Guardian Cryptic #29221 | 18 Down | 2023-11-07 flower

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