Clue: Cut in decimal rates (10)
Answer: PERCENTAGE
Explanation: Definition: "Cut", a share of the profits; also ="decimal rates", with rate in the sense of 'proportion', and 'decimal' meaning something like 'to do with powers of 10 – and in particular, 100'… or maybe 'numeric [and in base 10, e.g. 12.5%], and therefore not a fraction [1/8] or a ratio [1:7]…'