Is taught to have a lighter schedule (6)

I believe the answer is:

lesson

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'schedule' is the definition.
The answer and definition can be both related to communication as well as being singular nouns.
Maybe they are linked in a way I don't understand?

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

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(Other definitions for lesson that I've seen before include "What teacher provides" , "Seminar" , "A session in school or an example" , "Period of learning" , "Teaching session or reading from Bible" .)

I've seen this clue in the Evening Standard.

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