Predatory mammal some go on about? (8)
I believe the answer is:
mongoose
'predatory mammal' is the definition.
'some go on about?' is the wordplay.
'about?' indicates anagramming the letters (I've seen 'about' mean this).
'some'+'go'+'on'='somegoon'
'somegoon' with letters rearranged gives 'MONGOOSE'.
(Other definitions for mongoose that I've seen before include "Carnivorous mammal that slays snakes" , "Small mammal that preys on snakes" , "Predatory mammal known for killing snakes" , "Cat-like creature with long body and bushy tail" , "Slayer of snakes" .)