Crossword Genius

Figure a rail crash to bring a sort of infection (5)


I believe the answer is:


I'm a little stuck... Click here to teach me more about this clue!

'figure a' is the definition.
I can't judge whether this definition defines the answer.

'rail crash to bring a sort of infection' is the wordplay.
I cannot really understand how this works, but
an anagram of 'rail' is 'iral' which is located in the answer.
A single letter 'v' remains which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for viral that I've seen before include "Like pathological agents" , "Like the common cold" , "as an internet sensation" , "Relating to a pathogenic agent of disease" , "(Of video) fast spreading" .)

I've seen this clue in the Evening Standard.
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