Inaccurate in pitch (3,3)
I believe the answer is:
off key
'inaccurate in pitch' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for off key that I've seen before include "Inappropriate" , "played badly" , "using the wrong pitch" , "Dropped; hill" , "Musically, out of tune" .)