Unit of sand (5)
I believe the answer is:
grain
(Other definitions for grain that I've seen before include "Tiny amount" , "Small weight; seed" , "Small quantity (of corn etc)" , "Cereal seed" , "eg Barley" .)
I believe the answer is:
grain
(Other definitions for grain that I've seen before include "Tiny amount" , "Small weight; seed" , "Small quantity (of corn etc)" , "Cereal seed" , "eg Barley" .)