Cryptic crossword clue
Person who can’t spell anoints new members of old sect 13

The most common and most likely answer to this crossword clue is the 13 letter word MUGGLETONIANS

I've seen this crossword clue in The Guardian
M
U
G
G
L
E
T
O
N
I
A
N
S

Buddy explains!

The straight part
We know that "members of old sect" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case members of old sect = muggletonians.
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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