Ten-cent coins (5)
I believe the answer is:
dimes
'ten-cent coins' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for dimes that I've seen before include "Tenths of dollars" , "Ten-cent coins of USA" , "Tenths of a dollar" , "Ten cent pieces" , "$0.10n (n>1)" .)