Somehow get Nina something to fight disease (7)
I believe the answer is:
antigen
'something to fight disease' is the definition.
I can't tell whether this definition defines the answer.
'somehow get nina' is the wordplay.
'somehow' is an anagram indicator.
'get'+'nina'='getnina'
'getnina' is an anagram of 'ANTIGEN'.
Can you help me to learn more?
(Other definitions for antigen that I've seen before include "Something inducing an immune response, neat gin (anag.)" , "Biological substance" , "Immunity-booster" , "toxin" , "It stimulates immune responses - tag nine (anag)" .)