Dwarfs stay extremely desirable, they learn (8)

I believe the answer is:

students

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'they learn' is the definition.

I can't explain the remainder of the clue.

(Other definitions for students that I've seen before include "Pupils at school, university etc" , "Eg, undergraduates" , "Pupils, learners" , "Learners or scholars" , "Trainee medics possibly" .)

I've seen this clue in The Guardian.

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