
1) Certain organ part 2) Church-organ part 3) Flute for John 4) Organ component
Found on
https://www.crosswordclues.com/clue/reedpipe

(from the article `wind instrument`) In the third category of aerophones, reedpipes, the column of air is activated by the vibrations between the two parts of a double reed or those ... Egypt also made clarinets, instruments composed of two canes with three sides of a rectangle cut obliquely in the upper end of the two single reeds. ......
Found on
http://www.britannica.com/eb/a-z/r/25
No exact match found.