One in a hundred (4)
I believe the answer is:
cent
'one in a hundred' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for cent that I've seen before include "Small change" , "One-hundredth of the basic monetary unit" , "Fractional monetary unit" , "One hundredth of a euro" , "One hundreth of a dollar" .)