Bones for stays (7)
I believe the answer is:
remains
I believe this clue is a double definition.
'bones' is the first definition.
(thesaurus)
'stays' is the second definition.
('remain' can be a synonym of 'stay')
'for' acts as a link.
(Other definitions for remains that I've seen before include "Body after death" , "surviving old parts" , "What's left (maybe of a body)" , "Scraps" , "Stays behind" .)