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Clue “H I J K L M N O” only answer I can see is “water”
H2O (H to O) ?

You got it, an old clue but one that still makes me smile.

The series H to O is also a sequel which Collins Dictionary defines as "Anything that follows from something else." Both words appear in the completed puzzle and shows muddled thinking on the part of the puzzle compiler. All will be revealed tomorrow!

This one is often set in quizzes as a dingbat.

I can confirm that the answer was Water.