Seeker of eternal life St Michael converted (9)

I believe the answer is:

alchemist

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'seeker of eternal life' is the definition.
The answer and definition can be both people as well as being singular nouns.
Perhaps you can see a link between them that I don't see?

'st michael converted' is the wordplay.
'converted' indicates an anagram.
'st'+'michael'='stmichael'
'stmichael' is an anagram of 'ALCHEMIST'.

Can you help me to learn more?

(Other definitions for alchemist that I've seen before include "His hope to discover elixir of life" , "One seeking to produce gold, elixirs etc" , "he sought a panacea" , "St Michael (anag)" , "Medieval experimenter" .)

I've seen this clue in The Times.

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