Piano that is swamping another piano and organ part (4)
I believe the answer is:
pipe
This might be a double definition.
'piano that is swamping another piano' is the first definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'organ part' is the second definition.
('pipe' is part of 'organ')
'and' is the link.
(Other definitions for pipe that I've seen before include "Tropical fruit" , "Tube for conveying gas or liquid" , "Water carrier" , "Smoker's item" , "11th" .)