Very thin and bony (7)
I believe the answer is:
scrawny
'very thin and bony' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for scrawny that I've seen before include "Skin-and-bones" , "Being underweight" , "Thin and bony" , "Rawboned" , "Thin and scraggy" .)