The most common and most likely answer to this crossword clue is the 7 letter word CRINGES
I've seen this crossword clue in The Guardian
C
R
I
N
G
E
S
Buddy explains!

The straight part
We know that "Quails" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case quails = cringes.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 CRINGES mean?
CRINGES noun- A posture or gesture of shrinking or recoiling.
- A servile obeisance.
- A crick.
- An embarrassing event or situation which causes an onlooker to cringe.
- Someone or something that is cringy.
- To shrink, cower, tense or recoil, as in fear, disgust or embarrassment.
- To bow or crouch in servility.
- To contract; to draw together; to cause to shrink or wrinkle; to distort.