Not so busy on purpose? It's the ideal way (6,6)
I believe the answer is:
object lesson
'the ideal way' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.
'not so busy on purpose?' is the wordplay.
'not so busy' becomes 'lesson' (I can't explain this - if you can you should believe this answer much more).
'on' is a charade indicator (letters next to each other).
'purpose?' becomes 'object' (I've seen this in another clue).
'lesson' put after 'object' is 'OBJECT LESSON'.
'it's' is the link.
Can you help me to learn more?
(Other definitions for object lesson that I've seen before include "Instructive experience" , "Example typifying a principle" , "shows what one should do" , "punishment intended as a warning to others?" , "What may be striking" .)