25 across
Intense
dislike
of
one
training
the
fleas
(4-4)
Intense dislike of one training the fleas (4-4)
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The definition is at the beginning of the clue.
How the clue works
The definition is Intense dislike of one — hatred directed at oneself, naturally. Then "training the fleas" gives you the anagram: scramble the letters of the fleas and you've got your answer.