Cryptic crossword clue
Odd chap, albeit like characters in set 10

The most common and most likely answer to this crossword clue is the 10 letter word ALPHABETIC

I've seen this crossword clue in The Guardian
A
L
P
H
A
B
E
T
I
C


Buddy explains!

The straight part
We know that "like characters in set" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case like characters in set = alphabetic.
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.

What does ALPHABETIC mean?

ALPHABETIC adjective
  1. Of or relating to an alphabet, especially the characters A to Z, both uppercase and lowercase.

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