Priest has installed hot plate (6)
I believe the answer is:
lamina
'plate' is the definition.
(anatomical term for a plate or layer)
'priest has installed hot' is the wordplay.
I cannot really see how this works, but
'hot' could be 'in' (both can mean fashionable) and 'in' is found in the answer.
'priest' could be 'lama' (lama is a kind of priest) and 'lama' is found in the remaining letters.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for lamina that I've seen before include "Thin plate or layer" , "Flat plate" , "Thin plate or scale" .)