Instruction in the result of stripping (6)

I believe the answer is:

lesson

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'instruction' is the definition.
(I know that lesson is a type of instruction)

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

Can you help me to learn more?

(Other definitions for lesson that I've seen before include "Reading or exercise to be studied" , "Teaching session or Bible passage" , "Seminar" , "Severe reproof" , "Portion of instruction" .)

I've seen this clue in The Irish News.

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