The affix aṇ comes after a word ending in the Locative -7th case to denote 'what is prepared therein' -if that which is so prepared be 'granular food'.,
Thus भ्राष्ट्रे संस्कृता भक्षा = भ्राष्टाः 'a cake fried in the pan'. Similarly कालशाः कौम्भाः ॥ Why do we say \if it means food\? Observe पुष्पपुटे संस्कृतो मालागुणः ॥,