A little sand? (5)
I believe the answer is:
grain
This clue is a double definition.
'a little' is the first definition.
(thesaurus)
'sand?' is the second definition.
(thesaurus)
(Other definitions for grain that I've seen before include "Structure of wood" , "Small hard particle, of rice perhaps" , "bit of corn" , "Cereals" , "Small piece of sand" .)