An example of reduced activity (6)
I believe the answer is:
lesson
'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" .)