Seeing red, when parents support revolting princess? (2,7)
I believe the answer is:
in arrears
'seeing red' is the definition.
Both the answer and definition are adjectives. Maybe there's an association between them I don't understand?
'parents support revolting princess?' is the wordplay.
'parents' becomes 'rears' ('rear' can be a synonym of 'parent').
'support' is a charade indicator (letters next to each other) (in a down clue, some letters hold others up).
'revolting princess?' becomes 'inar' (I can't explain this - if you can you should believe this answer much more).
'rears' after 'inar' is 'IN ARREARS'.
'when' acts as a link.
Can you help me to learn more?
(Other definitions for in arrears that I've seen before include "Behindhand (with rent)" , "Late with payments" , "Owing" , "Position when a debt remains unpaid after its due date" , "Behind with payments" .)