What does the cryptic crossword clue "Vital neurotransmitter derived from ironstone (9)" mean?

This cryptic clue uses wordplay to arrive at the answer. Visit the page for progressive hints — definition, wordplay type, and a full step-by-step explanation.

Vital neurotransmitter derived from ironstone (9)

Telegraph Cryptic #31184 | 4 Down | 2026-03-11 flower

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