The most common and most likely answer to this crossword clue is the 8 letter word RELIABLE
I've seen this crossword clue in The Daily Telegraph
R
E
L
I
A
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E
More clues leading to the result RELIABLE
- Talented following religion, not half trustworthy
- Soldiers apt to be trustworthy
- Scripture studies likely to be trustworthy
- Honest, and once more responsible?
- Beer all drunk around lunchtime? That’s predictable
- Safe Liberal seat’s second Liberal
- Religious Education likely to be well grounded
- Trustworthy person who stops boat sinking after capsize on deserted lake
- Soldiers legally bound to be trustworthy
- King, prophet and expert, all together dependable
Buddy explains!

The straight part
We know that "dependabl" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case dependabl = reliable.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 RELIABLE mean?
RELIABLE noun- Something or someone reliable or dependable
- Suitable or fit to be relied on; worthy of dependence, reliance or trust; dependable, trustworthy
- (of a communication protocol) Such that either a sent packet will reach its destination, even if it requires retransmission, or the sender will be told that it didn't