The most common and most likely answer to this crossword clue is the 9 letter word OTHERWISE
I've seen this crossword clue in The Daily Telegraph
O
T
H
E
R
W
I
S
E
More clues leading to the result OTHERWISE
- Unmarried mum sensible under different conditions
- Servicemen protecting the Western Isles with energy? Not so
- White rose represented differently
- So wire the explosive in a different way
- Review to now include women’s groups in a different way
- Tories we ordered to capture hearts – or else!
- If not white, rose hybridised
- Mum, not married, sensible under different conditions
- Different white and rosé, perhaps
- Wet hero is to get changed or else!
Buddy explains!
The straight part
We know that "Failing that" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case failing that = otherwise.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 OTHERWISE mean?
OTHERWISE adjective- Other than supposed; different.
- (manner) Differently, in another way.
- In different circumstances; or else.
- In all other respects.