Food safety concern (1,4)
I believe the answer is:
e coli
'food safety concern' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for e coli that I've seen before include "Gut bugs" , "Bug that causes food poisoning" , "Bacterium found in the gut" , "Some types of this bacterium are toxic" , "cause of illness" .)