What does the cryptic crossword clue "Key not offering opening to this source of medicine? (4)" mean?

The definition is "source of medicine". The wordplay uses acrostic. VI (synonym="VI") + AL (synonym="Key") = VIAL; definition: "source of medicine?" The answer is VIAL.

Key not offering opening to this source of medicine? (4)

Guardian Cryptic #29047 | 1 Down | 2023-04-18 flower

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