Bony frame of piano used by singer (6)
I believe the answer is:
pelvis
'bony frame' is the definition.
(I've seen this before)
'piano used by singer' is the wordplay.
I cannot really understand how this works, but
'piano' could be 'p' (musical abbreviation) and 'p' is found in the answer.
'singer' could be 'elvis' (I've seen this before) and 'elvis' is present in the answer.
No letters remain.
This explanation may well be incorrect...
'of' is the link.
Can you help me to learn more?
(Other definitions for pelvis that I've seen before include "Hip structure" , "Large bony frame" , "Basin-shaped framework of bones at lower end of body" , "Large bone" , "Section between torso and legs" .)