Tubelight
Tubelight is a word used in Indian English, meaning someone who takes forever to understand a joke or a situation. In crosswords it is the 9-letter answer TUBELIGHT (9).
In a sentence
Don't bother explaining the plot to Rohan, he is a total tubelight; he'll get it by tomorrow.
Tubelight as a crossword answer
Tubelight is a 9-letter answer. A typical clue:
“Someone who takes forever to understand a joke or a situation” (9)
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