You might have one to pick (4)
I believe the answer is:
bone
'you might have one to pick' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for bone that I've seen before include "Ossified material" , "Possibly hammer" , "Skeleton material" , "Eg, radius or stirrup" , "Skeletal segment" .)