Eat nuts going bad, resulting in infection (7)
I believe the answer is:
tetanus
'infection' is the definition.
(tetanus is a kind of infection)
'eat nuts going bad' is the wordplay.
'going bad' indicates anagramming the letters.
'eat'+'nuts'='eatnuts'
'eatnuts' is an anagram of 'TETANUS'.
'resulting in' is the link.
(Other definitions for tetanus that I've seen before include "Disease causing muscle spasms" , "Infection from wound" , "Locker" , "infectious disease" , "health problem" .)