Clue: Why some did less? (4)
Answer: IDLE
Explanation: Definition: Why some did less
Hidden in *[some] *"d**ID LE**ss" 
*Don't really like this one. I can see what the setter is getting at, but the clue is for IDLENESS rather than IDLE which would require a verb to work as an answer to the question (e.g. "being" IDLE)