Worker in timeless place of worship penning detailed proclamation (8)
I believe the answer is:
employee
'worker' is the definition.
(employee is a kind of worker)
'timeless place of worship penning detailed proclamation' is the wordplay.
I cannot quite understand how this works, but
'place' could be 'pl' (abbreviation used in postal addresses) and 'pl' is located in the answer.
'of' could be 'o' and 'o' is present in the answer.
This explanation may well be incorrect...
'in' is the link.
Can you help me to learn more?
(Other definitions for employee that I've seen before include "Person working for wages or salary" , "Job-holder" , "Person in office" , "Paid worker" , "Hand" .)