Can't be caned - is really good (10)
I believe the answer is:
unbeatable
'good' is the definition.
Both the definition and answer are adjectives. Maybe there's an association between them I don't understand?
'can't be caned is really' is the wordplay.
I cannot quite see how this works, but
'be' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for unbeatable that I've seen before include "best" , "Invincible" .)