Possible Clues:

• Skye talk
• Sounds as if the seer has a gay lick
• Language needing to be regularly repressed
• Language in which 'Dia dhuit!' is 'Hello!'
• Kind of Gaelic for seer
• ... Gaelic, in later section of book
• The Irish seer is inside out
• Language some writer's employing
• Language of half the universe
• Irish relative