Part of the head church (6)
I believe the answer is:
temple
I believe this clue is a double definition.
'part of the head' is the first definition.
('temple' is part of 'head')
'church' is the second definition.
(I've seen this before)
(Other definitions for temple that I've seen before include "Coy, composed" , "child actress ..." , "Side of the head or religious building" , "House of prayer" , "Part of head - place of worship" .)