The most common and most likely answer to this crossword clue is the 6 letter word ODIOUS
I've seen this crossword clue in The Times
O
D
I
O
U
S
More clues leading to the result ODIOUS
- Horrible old Democrat promises to pay
- Disgusting old woman thus turning up outside university
- Tuneful, without Mel becoming offensive
- So do I stupidly accept upper class being offensive?
- Very unpleasant when cramped? Not half
- It’s unpleasant lacking funds with financial liabilities
- Awful swindle turned up evidence of debts
- Horrid Scrappy-Doo is taking a turn
- Horrific overdraft added to personal debts
- Foul island covered with smells? Run away
Buddy explains!

The straight part
We know that "Horrible" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case horrible = odious.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 ODIOUS mean?
ODIOUS adjective- Arousing or meriting strong dislike, aversion, or intense displeasure.