The most common and most likely answer to this crossword clue is the 11 letter word HEIR-AT-LAW
I've seen this crossword clue in Financial Times
H
E
I
R
-
A
T
-
L
A
W
Buddy explains!

The straight part
We know that "One might succeed" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case one might succeed = heir-at-law.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 HEIR-AT-LAW mean?
HEIR-AT-LAW noun- A person legally entitled to inherit the property of someone who dies intestate.