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Special April 1st puzzle. Great fun - not to be missed! Find it here:
https://www.theguardian.com/crosswords/cryptic/29345

Yes, good fun. Enjoyed the editorial interventions!

5d.

How do you even approach this when there are no words in the clue?

Does it related to other solutions, like 4d and 6d?

The whole NE corner is empty for me (and SE & SW)

druh
you have almost answered your first question in your first sentence!

I am lost. Is it some sort of mathematical formula/sequence?

What exactly is your problem with 5d?

There are no words in the clue; how can you begin to solve something in a crossword with no words?

As everyone knows I struggle with these things.

Am I missing something obvious?!

so, if there are no words in the clue...?

Then it must be a combination of numbers?

Roman numerals?

no, not numbers
i don't want to say any more as it might spoil the laugh when you see it!