Right opposite (5)
I believe the answer is:
wrong
'right opposite' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Maybe you can see an association between them that I don't see?
'right' is the wordplay.
I cannot quite see how this works, but
'right' could be 'r' (common abbreviation) and 'r' is present in the answer.
The remaining letters 'wong' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for wrong that I've seen before include "bad" , "Incorrect, illegal or immoral" , "Inappropriate" , "Failing to come right" , "Erroneous" .)