Problem in computer device struck leisure centres (5)
I believe the answer is:
virus
'problem' is the definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for virus that I've seen before include "Infectious particle" , "Microscopic infectious agent" , "Electronic threat" , "Cause of computer malfunctions?" , "Harmful agent to animals and computers" .)