The most common and most likely answer to this crossword clue is the 3 plus 3 plus 4 letter word THE FAB FOUR
I've seen this crossword clue in The Guardian
T
H
E
F
A
B
F
O
U
R
Buddy explains!
The straight part
We know that "Imagine writer being one of these Scousers!" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case imagine writer being one of these scousers! = the fab four.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.