Infers we’ve cracked this animal disease (5,5)
I believe the answer is:
swine fever
'animal disease' is the definition.
'swine fever' can be an answer for 'disease' (I have seen 'Disease of pigs ' mean 'swine fever' so perhaps 'disease' could also mean 'swine fever'). I'm not certain of the 'animal' bit.
'infers we've cracked' is the wordplay.
'cracked' indicates an anagram.
'infers'+'weve'='infersweve'
'infersweve' is an anagram of 'SWINE-FEVER'.
'this' acts as a link.
Can you help me to learn more?
(Other definitions for swine fever that I've seen before include "Viral disease of pigs" , "Porker's complaint" , "beastly complaint" .)