Try stopping animal hater (8)

'hater' is the definition.
(someone who detests)

'try stopping animal' is the wordplay.
I cannot quite see how this works, but
'try' could be 'test' (synonyms) and 'test' is present in the answer.
'animal' could be 'deer' (I've seen this before) and 'deer' is found in the leftover letters.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?