Crossword Genius

Told nine off for being idle (8)

Ross

I believe the answer is:

indolent

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'idle' is the definition.
(similar in meaning)

I don't understand how the remainder of the clue works.

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(Other definitions for indolent that I've seen before include "Lazy, disinclined to work" , "Lazy, slothful" , "Disinclined to exert oneself" , "Disinclined to exertion or work" , "not willing to work" .)

I've seen this clue in The Mirror.
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