More flesh visible in lecture (6)

I believe the answer is:

lesson

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'lecture' is the definition.
(I've seen this before)

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

(Other definitions for lesson that I've seen before include "Instructive experience" , "Moral" , "What teacher provides" , "Sermon or class session" , "Portion of instruction" .)

I've seen this clue in The Telegraph.

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