Based on the provided context, the most likely answer to the clue "Dat __ er nog maar aan!" (7 letters) is BEGINT.
Here's the reasoning:
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The phrase "Dat __ er nog maar aan!" is a common Dutch expression that suggests something is just about to start or happen.
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The blank space is 7 letters long, which narrows down the possible answers.
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The word "BEGINT" (7 letters) fits the context perfectly and completes the phrase as "Dat BEGINT er nog maar aan!".
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Other possible answers with 7 letters, such as "KOMT OP" or "ONTSTAAT," don't quite fit the meaning of the phrase as well as "BEGINT."
Therefore, the most appropriate answer to the clue is BEGINT.