Bone incorporated into life mural (5)
I believe the answer is:
femur
'bone' is the definition.
(I know that femur is a type of long bone)
'incorporated into life mural' is the wordplay.
'incorporated into' says the answer is hidden in the clue.
'FEMUR' can be found hidden inside 'life mural'.
(Other definitions for femur that I've seen before include "bit of leg" , "Large bone" , "Thigh bone" , "Longest bone in the human body" , "Part of leg" .)