Crossword Genius

What kids never play at school (6)

Ross

I believe the answer is:

truant

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'play at school' is the definition.
Both the definition and answer are adjectives. Maybe there's a link between them I don't understand?

I cannot understand how the remainder of the clue works.

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(Other definitions for truant that I've seen before include "One cutting school" , "Pupil absent without permission" , "One is absent from school without permission" , "errant schoolchild" , "Runaway" .)

I've seen this clue in The Times.
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