What is the answer to "Father of 66-Down" in the Newsday Crossword?

The answer to the Newsday Crossword clue "Father of 66-Down" is ISAAC (5 letters).

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Father of 66-Down Newsday Crossword Clue

Down clue · from the September 13, 2026 puzzle

Stuck on “Father of 66-Down” from the Newsday Crossword? Here is the verified answer:

Answer

ISAAC

5 letters · Down · last seen September 13, 2026

Bar bills4 Teddy Roosevelt's successor4 Mysterious glow4 __ B'rith (Zionism advocate)4 Scholarship allowance7 Compensated4 Contribute5 Mandela's former org.3 Pressed for time7 Discourages6 __ line to (write)5 Sink outlet5