Part of a piano (3)
I believe the answer is:
key
(Other definitions for key that I've seen before include "Piano lever" , "Device for lock" , "It opens the door" , "Small island" , "Scale system for music" .)
I believe the answer is:
key
(Other definitions for key that I've seen before include "Piano lever" , "Device for lock" , "It opens the door" , "Small island" , "Scale system for music" .)