The —, 1610 stage play by Ben Jonson featuring the character Dol Common (9)
I believe the answer is:
alchemist
(Other definitions for alchemist that I've seen before include "One seeking to produce gold, elixirs etc" , "The St Michael who tried to turn metal to gold" , "Seeker after gold" , "one trying to find the elixir of life" , "Early experimenter" .)