What does the cryptic crossword clue "Poisonous substance: it's irrelevant, surprisingly (6,7)" mean?

The definition is "Poisonous substance:". The wordplay uses an anagram. anagram of ITSIRRELEVANT ("it's irrelevant,") [anagram: "surprisingly"] = SILVERNITRATE; definition: "Poisonous substance:" The answer is Silver nitrate.

Poisonous substance: it's irrelevant, surprisingly (6,7)

Telegraph Prize Cryptic #3090 | 7 Down | 2021-01-10 flower

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