Anger about a point in the matter (2,2)
I believe the answer is:
in re
'the matter' is the definition.
Both the answer and definition are singular nouns.
Maybe there's an association between them I don't understand?
'anger about a point' is the wordplay.
'anger' becomes 'ire' (ire is intense rage).
'about' means one lot of letters goes inside another.
'a point' becomes 'N' (North).
'ire' enclosing 'n' is 'IN RE'.
'in' is the link.
Can you help me to learn more?
(Other definitions for in re that I've seen before include "Concerning (L)" , "With regard to" , "In the matter of (Lat.)" .)