Arrange a fight overseen by British boxing? (5,5)
I believe the answer is:
bring about
'arrange' is the definition.
(synonyms)
'a fight overseen by british boxing?' is the wordplay.
'fight' becomes 'bout' (as in a bout in boxing).
'overseen by' is a charade indicator (letters next to each other) (in a down clue, some letters go above others).
'british boxing?' becomes 'bring' (I can't justify this - if you can you should give a lot more credence to this answer).
'a'+'bout'='about'
'about' after 'bring' is 'BRING ABOUT'.
Can you help me to learn more?
(Other definitions for bring about that I've seen before include "Cause" , "Create" .)