In which to worship head-pieces (7)
I believe the answer is:
temples
'pieces' is the definition.
(temple is a kind of piece)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for temples that I've seen before include "Places of worship" , "Houses of worship" , "Buildings for the workship of gods" , "Buildings for the workshop of gods" , "Cerebral" .)