The most common and most likely answer to this crossword clue is the 3 plus 9 letter word THE WASTELAND
I've seen this crossword clue in The Guardian
T
H
E
W
A
S
T
E
L
A
N
D
Buddy explains!
The straight part
We know that "work by 14 of more than one 6" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case work by 14 of more than one 6 = the wasteland.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.