One such as eats mice potentially? (7,3)
I believe the answer is:
siamese cat
'one' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.
'as eats mice potentially?' is the wordplay.
'potentially?' is an anagram indicator (I've seen 'potentially' mean this (letters have the potential to spell a new word)).
'as'+'eats'+'mice'='aseatsmice'
'aseatsmice' with letters rearranged gives 'SIAMESE CAT'.
'such' acts as a link.
Can you help me to learn more?
(Other definitions for siamese cat that I've seen before include "Kitty" , "Domestic pet" , "Animal" , "Carnivore" , "What might be cunning" .)