Bank worry (3)
'bank worry' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for run that I've seen before include "Control" , "Cricket score; go" , "publish" , "Drive" , "A single" .)
(Other definitions for erosion that I've seen before include "Abrasion" , "The wearing away by weather 97)" , "Gradual decline" , "The wearing away as by wind or water" , "being eaten away" .)