The most common and most likely answer to this crossword clue is the 10 letter word LOCKSMITHS
I've seen this crossword clue in The Guardian
L
O
C
K
S
M
I
T
H
S
More clues leading to the result LOCKSMITHS
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 LOCKSMITHS mean?
LOCKSMITHS noun- One who practices locksmithing
- Someone who only bets when they are sure they will win