The most common and most likely answer to this crossword clue is the 5 letter word OMITS
O
M
I
T
S
More clues leading to the result OMITS
- Trimmed blossom: it spread leaves out
- Gutted officials cover up US university fails
- Is sick after five cancelled bypasses
- Drops moist pants
- American university map-maker passes over, misses out
- Skips over with German lead singer
- Fails to mention Cambridge University probing map maker
- Wring 25 drops
- Drops moist crackers
- Order computers society doesn’t mention
Buddy explains!

The straight part
We know that "Fails to mention" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case fails to mention = omits.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 OMITS mean?
OMITS verb- To leave out or exclude.
- To fail to perform.
- To neglect or take no notice of.