Clue: Grecian urn of lead-free pungent mineral on core of alabaster (7)
Answer: AMPHORA
Explanation: Definition: Grecian urn
A charade of [c]AMPHOR ('pungent mineral'; 'mineral' tends to suggest rocks to me, while camphor is produced by various plants) minus its first letter ('lead-free') plus A ('core of alab**A**ster').