Boy into minor sets of exercises (7)
I believe the answer is:
lessons
'sets of exercises' is the definition.
The answer and definition can be both acts as well as being plural nouns.
Perhaps they are linked in a way I don't understand?
'boy into minor' is the wordplay.
'boy' becomes 'son' (male child).
'into' means one lot of letters goes inside another.
'minor' becomes 'less' (I've seen this before).
'son' going inside 'less' is 'LESSONS'.
Can you help me to learn more?
(Other definitions for lessons that I've seen before include "Teaching periods" , "Tutorials" , "They're learnt" , "Units of instruction" , "Lectures" .)