Holey (6)
I believe the answer is:
porous
'holey' is the definition.
(I know that holey can be written as porous)
This is the entire clue.
(Other definitions for porous that I've seen before include "Permeable to water etc" , "Pitted with small holes like skin" , "Allowing air/liquid to pass through" , "Permeable to liquids" , "Riddled with tiny holes like skin" .)