Like some skill-building classes (8)
I believe the answer is:
remedial
'like some skill-building classes' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for remedial that I've seen before include "for slow learners" , "Deem liar to be healing" , "Providing a cure for disease or deficiency" , "appropriate for poor learners" , "for the lower classes" .)