Crossword Genius

It can go on spreading disease (9)

Ross

I believe the answer is:

contagion

'disease' is the definition.
(contagion is a kind of disease)

'it can go on spreading' is the wordplay.
'spreading' is an anagram indicator.
'it'+'can'+'go'+'on'='itcangoon'
'itcangoon' with letters rearranged gives 'CONTAGION'.

(Other definitions for contagion that I've seen before include "cause of widespread ill-feeling" , "Communication of disease by close contact" , "Infection" , "Cognation (anag.)" .)

I've seen this clue in The Telegraph and The Times.
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