
1) Festival in ancient Athens 2) Non-Gregorian July observance
Found on
https://www.crosswordclues.com/clue/kronia

The Kronia was an Athenian festival held in honor of Cronus (Greek Kronos) on the 12th day of Hekatombaion, the first month of the Attic calendar and roughly equivalent to the latter part of July and first part of August. The festival was also celebrated in parts of Ionia, and in these places the month was known as Kronion after the festival. The ...
Found on
http://en.wikipedia.org/wiki/Kronia

Kronia is a cultivated variety of potato.
Found on
http://www.probertencyclopaedia.com/browse/QK.HTM
No exact match found.