Cryptic crossword clue
Potter makes this error — green spilled over, and blue ultimately 8

The most common and most likely answer to this crossword clue is the 8 letter word SLIPWARE

S
L
I
P
W
A
R
E

Buddy explains!

The straight part
We know that "Potter makes this" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case potter makes this = slipware.
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 SLIPWARE mean?

SLIPWARE noun
  1. A type of pottery identified by its primary decorating process where slip is placed onto the dry surface by dipping, painting or splashing.

Latest crossword clues with full explanations