Crossword Genius

Reduced amount added on for class? (4)

Ross

I believe the answer is:

less

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This could be a double definition.

'reduced amount' is the first definition.
(I've seen this in another clue)

'added on for class?' is the second definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.

Can you help me to learn more?

(Other definitions for less that I've seen before include "Comparatively little" , "Fewer in number" , "In smaller quantity" , "Wanting" , "inferior" .)

I've seen this clue in The Irish Times.
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