Possible Clues:

• Dash in to this nationality
• Somewhat like Judo master's pastry?
• Lolland language
• Like Hamlet and his rotten state
• Relating to one from Copenhagen, say
• It could be blue at the end of 9 across from abroad
• Describing Hamlet and his rotten state
• Sweet, buttery pastry
• It may be blue for an addition in the dish
• An addition in the plate to make it blue enough to eat