Possible Clues:

• Talk of the Gaels
• "An Caighdeán Oifigiúil" language
• 'Whiskey' source
• Irish poetry needing no introduction
• Goidelic language
• Early Irish tongue
• Tongue supplied by butcher's emporium
• Language of poetry beginning to wither away
• No time for abrupt language
• Language that's a letter off from 26-Across