The most common and most likely answer to this crossword clue is the 9 letter word CUFFLINKS
I've seen this crossword clue in The Guardian
C
U
F
F
L
I
N
K
S
Buddy explains!
The straight part
We know that "They’ll get through at least four holes" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case they’ll get through at least four holes = cufflinks.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 CUFFLINKS mean?
CUFFLINKS noun- A button or stud used to hold a sleeve cuff together.