What does the cryptic crossword clue "Two gins and it mixed for setting off (8)" mean?

The wordplay uses an anagram. anagram of GIN (synonym="GIN") + GIN (synonym="GIN") + IT (synonym="IT") = IGNITING The answer is IGNITING.

Two gins and it mixed for setting off (8)

Guardian Cryptic #29467 | 9 Across | 2024-08-21 flower