Cryptic crossword clue
Loyal Irishman’s nervous reaction, imbibing port 9

The most common and most likely answer to this crossword clue is the 9 letter word PATRIOTIC

I've seen this crossword clue in The Daily Telegraph
P
A
T
R
I
O
T
I
C


Buddy explains!

The straight part
We know that "Loyal" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case loyal = patriotic.
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 PATRIOTIC mean?

PATRIOTIC adjective
  1. Inspired by or showing patriotism; done out of love of one's country; zealously and unselfishly devoted to the service of one's country

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