Tricked involving end of lesson taught without challenge
I believe the answer is:
spoon-fed
'lesson taught without challenge' is the definition.
I can't tell whether this defines the answer.
'tricked involving end' is the wordplay.
'tricked' becomes 'spoofed' (I've seen this before).
'involving' is an insertion indicator.
'end' becomes 'n' (I am not sure about this - if you are sure you should believe this answer much more).
'spoofed' placed around 'n' is 'SPOON-FED'.
'of' is the link.
Can you help me to learn more?
(Other definitions for spoon-fed that I've seen before include "Feather-bedded" , "Given excessive help, like baby receiving nourishment" , "Mollycoddled" , "Mae life too easy for (someone)" , "Cosseted" .)