Possible Clues:

• Like Dutch fellow climbing, showing obsessional enthusiasm
• Maybe like Dutch or Danish king, say, flipping frenzied!
• Teutonic
• Deviously, it's me caring about a linguistic family
• European king, say, turned mad
• Describes the English language spoken in 8 across at independent college
• Like The Goth's description of 3 down, for example
• From the start of 14 across is in charge of north central European people
• Relating to people of northcentral Europe