The most common and most likely answer to this crossword clue is the 10 letter word CONFIDENCE
I've seen this crossword clue in The Daily Telegraph
C
O
N
F
I
D
E
N
C
E
More clues leading to the result CONFIDENCE
- Against fellow’s independent study on church faith
- Private communication of faith
- Caught on boundary? I had got in, showing excess of this?
- Trust prisoner to dispose of stolen goods without identification
- Shared secret belief
- Trick receiver of stolen goods, assuming I had courage
- Secret identity criminal duo possessed
- Trust uninitiated kid to run through barricade in pursuit of criminal
- Secret kind of trick
Buddy explains!

The straight part
We know that "Trust" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case trust = confidence.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 CONFIDENCE mean?
CONFIDENCE noun- Self-assurance.
- A feeling of certainty; firm trust or belief; faith.
- Information held in secret.
- Boldness; presumption.