Cryptic crossword clue
Fellow Nationalist replacing Liberal in Northern Ireland — joker! 7

The most common and most likely answer to this crossword clue is the 7 letter word FUNSTER

I've seen this crossword clue in The Daily Telegraph
F
U
N
S
T
E
R

Buddy explains!

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 FUNSTER mean?

FUNSTER noun
  1. A fun person.

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