The most common and most likely answer to this crossword clue is the 9 plus 5 plus 1 letter word WATERFORD GLASS A
I've seen this crossword clue in The Sunday Telegraph
W
A
T
E
R
F
O
R
D
G
L
A
S
S
A
Buddy explains!
The straight part
We know that "that’s clearly made in Irish city" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case that’s clearly made in irish city = waterford glass a.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.