The most common and most likely answer to this crossword clue is the 5 letter word BELIE
B
E
L
I
E
More clues leading to the result BELIE
- Misrepresent ideology, ignoring final part
- Contradict most of religious doctrine
- To misrepresent is essential to libel, I explain
- Fail to justify faith with no end of grief
- Fail to justify short strike in other words
- Fail to justify inconclusive opinion
- Discredit inconclusive faith
- Contradict opinion lacking force
Buddy explains!

The straight part
We know that "Fail to justify" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case fail to justify = belie.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 BELIE mean?
BELIE verb- To lie around; encompass.
- (of an army) To surround; beleaguer.
- To tell lies about.
- To give a false representation of.
- To contradict, to show (something) to be false.
- To conceal the contradictory or ironic presence of (something).
- To show, evince, demonstrate: to show (something) to be present, particularly something deemed contradictory or ironic.
- To mimic; to counterfeit.
- To fill with lies.