The most common and most likely answer to this crossword clue is the 7 letter word LOATHED
I've seen this crossword clue in The Daily Telegraph
L
O
A
T
H
E
D
More clues leading to the result LOATHED
Buddy explains!

The straight part
We know that "Hated" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case hated = loathed.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does LOATHED mean?
LOATHED verb- To detest, hate, revile.