Rush made by operator not getting on (5)
I believe the answer is:
surge
'rush' is the definition.
(I know that rush can be written as surge)
'operator not getting on' is the wordplay.
'operator' becomes 'surgeon' (I've seen this before).
'not getting' suggests deleting specific letters.
'surgeon' with 'on' taken out is 'SURGE'.
'made by' is the link.
(Other definitions for surge that I've seen before include "Rapid increase; powerful movement" , "Rise suddenly" , "significant increase" , "Sudden increase, gush" , "Well up" .)