Expedient appreciated by bored pupils? (5-4)

I believe the answer is:

short-term

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'expedient' is the definition.
Both the definition and answer are adjectives. Perhaps there's a link between them I don't understand?

I don't understand the rest of the clue.

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(Other definitions for short-term that I've seen before include "Not lasting long" , "Concerned only with the immediate future" , "Concerned with the near future" , "Not concerned with long timescales" , "Not long-lasting" .)

I've seen this clue in The Guardian.

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