Judge sports referee should get a change of scene (4)
I believe the answer is:
Here is my best explanation:
'referee should get a change of scene' is the definition.
I can't tell whether this defines the answer.
'judge sports' is the subsidiary indication.
'judge' becomes 'j'.
'sports' becomes 'ump' (I can't justify this - if you can you should believe this answer much more).
(Other definitions for jump that I've seen before include "Make abrupt movement - start", "Start", "Leap (high, long or triple)", "Suddenly rise", "Sudden large increase", "Hurdle", "Suddenly increase", "Leap, bound", "Attack" and "Vault, bound".)