The most common and most likely answer to this crossword clue is the 11 letter word PESSIMISTIC
I've seen this crossword clue in The Times
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The straight part
We know that "favouring the downward direction?" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case favouring the downward direction? = pessimistic.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 PESSIMISTIC mean?
PESSIMISTIC adjective- Marked by pessimism and little hopefulness; expecting the worst.
- Pertaining to the worst-case scenario.
- Taking out exclusive locks on data to prevent conflicts with other processes that might modify it.