Church instruments (6)
I believe the answer is:
organs
'church instruments' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for organs that I've seen before include "Periodicals published by special interest groups" , "Functional parts of the body, or musical instruments" , "Such as liver, heart, etc" , "Keyboard instruments and body parts" , "Heart and lungs are vital ones" .)