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An example of reduced activity (6)

Ross

I believe the answer is:

lesson

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'an example' is the definition.
(I know that example can be written as lesson)

'reduced activity' is the wordplay.
'reduced' becomes 'less' (a reduced amount).
'activity' becomes 'on' (I can't justify this - if you can you should believe this answer much more).
'less'+'on'='LESSON'

'of' is the link.

Can you help me to learn more?

(Other definitions for lesson that I've seen before include "Teaching unit" , "Teaching period" , "Sermon or teaching session" , "Teaching session or reading from Bible" , "Unit of instruction" .)

I've seen this clue in The Globe and Mail.
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