Bones from carcass lying around (5)
I believe the answer is:
sacra
'bones' is the definition.
(sacrum is a kind of bone)
'from carcass lying around' is the wordplay.
'from' indicates the answer is hidden within the clue.
'lying around' says the letters should be written backwards.
'arcas' is hidden in the letters of 'carcass'.
'arcas' in reverse letter order is 'SACRA'.
(Other definitions for sacra that I've seen before include "Triangular bones" , "Bones that form the human pelvic arch" .)