Smooths wood (5)
I believe the answer is:
sands
'smooths wood' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for sands that I've seen before include "They run out (of time)" , "Polishes (eg, wood)" , "Smooths" , "The Riddle of the . . . . . (novel by Erskine Childers)" , "Rubs smooth" .)