In haste, taste concoction created by hospital worker (12)

I believe the answer is:

anaesthetist

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'by hospital worker' 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 can't see?

'in haste taste concoction' is the wordplay.
'concoction' indicates anagramming the letters.
'in'+'haste'+'taste'='inhastetaste'
'inhastetaste' with letters rearranged gives 'ANAESTHETIST'.

'created' is the link.

Can you help me to learn more?

(Other definitions for anaesthetist that I've seen before include "Hospital theatre worker" , "One preparing patients for operations" , "Number" .)

I've seen this clue in The Irish Times.

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