Hero's one for villain — friend to Caesar, J? (7)
I believe the answer is:
antonym
'caesar j?' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.
'hero's one for villain friend' is the wordplay.
I cannot really understand how this works, but
'one' could be 'an' (an apple is one apple) and 'an' is located in the answer.
'for' could be 'to' (eg both can mean 'in the opinion of') and 'to' is located in the answer.
The remaining letters 'nym' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
'to' acts as a link.
Can you help me to learn more?
(Other definitions for antonym that I've seen before include "Word that means the opposite of another" , "Opposite-meaning word" , "As 'happy' is to 'sad' or 'long' to 'short'" , "opposing term" , "Nick's could be free" .)