Bars in the organ parts (5)
I believe the answer is:
stops
This could be a double definition.
'bars' is the first definition.
The answer and definition can be both acts as well as being plural nouns.
Perhaps there's a link between them I don't understand?
'organ parts' is the second definition.
(I've seen this in another clue)
'in the' is the link.
Can you help me to learn more?
(Other definitions for stops that I've seen before include "Ceases" , "Posts (anag.)" , "Discontinues" , "Halts" , "Checks" .)