Judge and arbitrator in change of scene (4)
I believe the answer is:
jump
'change of scene' is the definition.
'jump' can be an answer for 'change' (jump is a kind of change). I am not sure about the 'of scene' bit.
'judge and arbitrator' is the wordplay.
'judge' becomes 'J' (abbreviation for judge).
'and' is a charade indicator (letters next to each other).
'arbitrator' becomes 'ump' (I can't explain this - if you can you should give a lot more credence to this answer).
'j'+'ump'='JUMP'
'in' acts as a link.
Can you help me to learn more?
(Other definitions for jump that I've seen before include "Suddenly increase" , "Vault, bound" , "React with surprise" , "Suddenly rise" , "Hurdle" .)