The most common and most likely answer to this crossword clue is the 10 letter word HANGERS-ON
I've seen this crossword clue in Financial Times
H
A
N
G
E
R
S
-
O
N
Buddy explains!

The straight part
We know that "Dependants" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case dependants = hangers-on.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 HANGERS-ON mean?
HANGERS-ON noun- Someone who hangs on, or sticks to, a person, place, or service.
- An onsetter.