Splinters of wood in sheds (6)
I believe the answer is:
spills
I believe this clue is a double definition.
'splinters of wood' is the first definition.
'sheds' is the second definition.
('spill' can be a synonym of 'shed')
'in' is the link.
(Other definitions for spills that I've seen before include "Pieces of rolled paper used to light fires" , "Causes liquid to flow out" , "Pieces of rolled paper used to light a fire" .)