Here are the possible solutions for one might code a virus clue
Answer
Clue
Relevancy
hacker
Clue
One might code a virus
Definition
one that hacks
malware
Clue
It might give you a virus
Definition
a computer program designed to cause damage or disruption to a system
igpayatinlay
Clue
Secret code, in the secret code
sku
Clue
Code hidden in a bar code
fatalerror
Clue
A virus may cause one
dag
Clue
Former UN leader Hammarskjöld [Note: The circled letters comprise a three-word instruction that, when applied to one square in the completed grid, reveals a group who might follow a code of silence]