The most common and most likely answer to this crossword clue is the 5 letter word BARRY
B
A
R
R
Y
More clues leading to the result BARRY
Buddy explains!

The straight part
We know that "Welsh town" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case welsh town = barry.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 BARRY mean?
BARRY noun- A field divided transversely into several equal parts, and consisting of two different tinctures interchangeably disposed.