Just One Can Spoil the Whole Fruit Barrel
This page is the CodyCross answer for the clue below from Airport, Group 458, Puzzle 1 (Controlled Airspace).
Question is: Just One Can Spoil the Whole Fruit Barrel
and the answer is: BADAPPLE
Word Meaning:
BAD APPLE — (idiomatic, often in the plural) A person who is not wholesome, honest, or trustworthy, especially one who has an adverse influence on others.
Definitions from Wiktionary.