Reason for a food recall (1,4)
'reason for a food recall' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for e coli that I've seen before include "Cause of internal problem" , "Gut bugs" , "cause of illness" , "Cause of infection" , "Bacterium found in the gut" .)
(Another definition for ecoli that I've seen is " Bacterium".)