Cryptic crossword clue
Henry is at intervals King and, nominally, 11 24 4

The most common and most likely answer to this crossword clue is the 4 letter word ERIK

I've seen this crossword clue in Independent
E
R
I
K

Buddy explains!

The straight part
We know that "nominally (i.e. the title character of) 11 24 (the Phantom of the Opera)" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case nominally (i.e. the title character of) 11 24 (the phantom of the opera) = erik.
The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.
This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.

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